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Layered Double Hydroxides: Morphology, Interlayer Anion, and the Origins of Life

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The preparation of layered double hydroxides via co-precipitation of a divalent/trivalent metal solution against a base results in 1 mm LDH particles with a disorganized metal lattice. Research was performed to address these morphological issues using techniques such as Ostwald ripening and precipitation via aluminate. Another interesting issue in layered double hydroxide materials is the uptake and orientation of anions into the interlayer. Questions about iron cyanide interlayer anions have been posed. Fourier transform infared spectroscopy and powder x-ray diffraction have been used to investigate these topics. It was found that factors such as orientation, anion charge, and anion structure depended on the divalent/trivalent metal ratio of the hydroxide layer and reactivity time. The cyanide self-addition reaction is an important reaction of classical prebiotic chemistry. This reaction has been shown to give rise to amino acids, purines and pyrimidines. At cyanide concentrations similar to that expected on the early earth, hydrolysis to formamide rather than self-addition occurs. One theory to alleviate this side reaction is the use of minerals or clays that are thought to concentrate and catalyze prebiotics of interest. Layered double hydroxides have been studied as a catalyst for this reaction.
Date: December 2002
Creator: Halcom-Yarberry, Faith Marie
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Cognitive and Perceptual-Motor Indicators of Lateralized vs. Diffuse Brain Damage in Adults.

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Among the goals of the neuropsychological assessment are to detect the presence of brain damage, localize which areas of the brain may be dysfunctional and describe subsequent functional impairments. The sensitivity of neuropsychological instruments in carrying out these functions is a question of some debate. The purpose of this study is to determine the utility of lateralizing indicators from the WAIS-III, McCarron Assessment of Neuromuscular Development (MAND) and Haptic Visual Discrimination Test (HVDT), from the McCarron-Dial System Neuropsychological Assessment Battery (MDS), in ascertaining the presence or absence of brain damage as well as location of lesion. The classification accuracies of using performance level indicators from these tests and lateralizing indicators, alone and together, were compared.
Date: December 2002
Creator: Gregory, Erin Kathleen Taylor
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Automatic Software Test Data Generation

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In software testing, it is often desirable to find test inputs that exercise specific program features. Finding these inputs manually, is extremely time consuming, especially, when the software being tested is complex. Therefore, there have been numerous attempts automate this process. Random test data generation consists of generating test inputs at random, in the hope that they will exercise the desired software features. Often the desired inputs must satisfy complex constraints, and this makes a random approach seem unlikely to succeed. In contrast, combinatorial optimization techniques, such as those using genetic algorithms, are meant to solve difficult problems involving simultaneous satisfaction of many constraints.
Date: December 2002
Creator: Munugala, Ajay Kumar
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Wisdom and Law: Political Thought in Shakespeare's Comedies

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In this study of A Midsummer Night's Dream, The Merchant of Venice, and Measure for Measure I argue that the surface plots of these comedies point us to a philosophic understanding seldom discussed in either contemporary public discourse or in Shakespearean scholarship. The comedies usually involve questions arising from the conflict between the enforcement of law (whether just or not) and the private longings (whether noble or base) of citizens whose yearnings for happiness tend to be sub- or even supra-political. No regime, it appears, is able to respond to the whole variety of circumstances that it may be called upon to judge. Even the best written laws meet with occasional exceptions and these ulterior instances must be judged by something other than a legal code. When these extra-legal instances do arise, political communities become aware of their reliance on a kind of political judgment that is usually unnoticed in the day-to-day affairs of public life. Further, it is evident that the characters who are able to exercise this political judgment, are the very characters whose presence averts a potentially tragic situation and makes a comedy possible. By presenting examples of how moral and political problems are dealt with by …
Date: December 2002
Creator: Major, Rafael M.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Nature By Design

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Organic forms representing nature, but not particular species, are combined with elements signifying attitudes toward the natural world with an emphasis on North American culture. The viewer is encouraged to consider human effects on the environment. Aquarium Night Light and Trophy both refer to the human tendency for commercial exploitation coupled with the creation of nature images we sometimes seem to prefer over the reality of the natural world. Reliquary metaphorically connects traditional religious connotations associated with saints' relics to both a biblical injunction to use anything we needed from the natural world and our contemporary belief that exposure to nature can have beneficial effects on human mental, spiritual, and physical health.
Date: December 2002
Creator: Lingle, Linda A.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Structural Analysis of the TOL pDK1 xylGFJQK Region and Partial Characterization of the xylF and xylG Gene Products

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TOL plasmids encode enzymes responsible for utilization of toluene and related aromatic compounds by Pseudomonas putida, ultimately converting them to central metabolic intermediates. The nucleotide sequence for the 5.6 kb xylGFJQK region of the pDK1 TOL meta operon was determined. DNA sequence analysis revealed the presence of five open reading frames corresponding to xylG (1458 bp), xylF (846 bp), xylJ (783 bp), xylQ (936 bp) and xylK (1047 bp), encoding predicted protein products of 51.6, 31.3, 27.8, 32.8, and 36.6 kDa in size, respectively. The average G+C content of the xylLTEGFJQK region was 65.7%, somewhat higher than the 58.9% seen in the immediately upstream xylXYZ region and substantially more than the 50% G+C content reported for the upper TOL operon of this plasmid. Homology comparisons were made with genes and proteins of related catabolic plasmids. The dmpCDEFG and pWWO xylGFJQK regions exhibit consistently high levels of nucleotide and amino acid homology to pDK1 xylGFJQK throughout the entire region. In contrast, although the nucleotide sequence homology of the Acinetobacter atdCDE region to xylGFJ is high, the homology of atdFG to xylQK is markedly less. Such radical changes in homology between corresponding regions of different operons, combined with variable base and codon …
Date: December 1999
Creator: Poulter, Melinda D.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

The Potential of Coelomocyte Chemotaxis as an Immune Biomarker in the Earthworm, Lumbricus terrestris

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Coelomocyte migration responses, both random and chemotatic, were examined in the earthworm Lumbricus terrestris. Coelomocyte random migration patterns towards non-stimulatory, non-chemotatic solutions were described. Migration responses to immunostimulatory agents lipopolysaccharides (LPS), N-formly-methionyl-leucyl-phenylalanine (FMLP), sheep erythrocytes, Saccharomyces cerevisiae, Aeromonas hydrophila, Eisenia fetida and Rhabditis pellio were characterized. Chemotaxis was reported to LPS, FMLP, sheep erythrocytes, S. cerivesae and E. fetida. Bio-indicator potential of chemotaxis is discussed relative to variability in migration responses.
Date: December 1999
Creator: Mota, Jennifer A.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

John Buchan (1875-1940) and the First World War: A Scot's Career in Imperial Britain

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This dissertation examines the political career of Scottish-born John Buchan (1875-1940) who, through the avenue of the British Empire, formed political alliances that enabled him to enter into the power circles of the British government. Buchan's involvement in governmental service is illustrative of the political and financial advantages Scots sought in Imperial service. Sources include Buchan's published works, collections of correspondence, personal papers, and diaries in the holdings of the National Library of Scotland, Edinburgh. Letters and other documents pertaining to Buchan's life and career are also available in the Beaverbrook papers, Lloyd George papers, and Strachey papers at the House of Lords Record Office, London, and in the Liddle Hart Collection at King's College, London. Documents concerning Buchan's association with the War Cabinet, the Foreign Office, and the Department of Information are among those preserved at the Public Record Office, London. References to Buchan's association with the British Expeditionary Force in France are included in the holdings of the Intelligence Corps Museum, Ashford, Kent. The study is arranged chronologically, and discusses Buchan's Scottish heritage, his education, his assignment on Lord Alfred Milner's staff in South Africa, and his appointment as Director of the Department of Information during World War …
Date: December 1999
Creator: Mann, Georgia A.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

'...and one of time.': A Composition for Full Orchestra with Narration

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‘...and one of time.' is a reinterpretation of a small musical moment from Philip Glass' opera, Einstein on the Beach, centered around the phrase "Berne, Switzerland 1905." This reinterpretation is realized through the use of several different compositional techniques including spectral composition, micropolyphony and dodecaphony, as well as the application of extra-musical models developed by Alan Lightman, John Gardner, Italo Calvino and Albert Einstein.
Date: December 1999
Creator: Rinker, John Thomas
Object Type: Thesis or Dissertation
System: The UNT Digital Library

As Darkness Falls: A Composition for Wind Ensemble

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As Darkness Falls is a composition that explores our interaction with several aspects of darkness through the use of musical imagery. The imagery attempts to reflect the moods, feelings, and impressions of a person as he or she interacts with darkness. The non-programmatic character of the composition allows listeners to superimpose their own experiences onto the musical tapestry in order to manifest a personal connection between the listener and the music. As Darkness Falls is a composition scored for a minimum instrumentation of piccolo, 6 flutes, 3 oboes, 3 bassoons, 9 B-flat clarinets, B-flat bass clarinet, 2 E-flat alto saxophones, B-flat tenor saxophone, E-flat baritone saxophone, 4 B-flat trumpets, 4 horns in F, 3 tenor trombones, bass trombone, 2 euphoniums, 2 tubas, timpani, and 4 percussionists. The music consists of three movements (slow-slow-fast) lasting a total of approximately seventeen minutes. The duration of each of the three movements is six minutes, four and one-half minutes, and six and one-half minutes, respectively. The document also contains an analysis of the work by the composer. The analysis explores the compositional style of the work, focusing on musical aspects within each movement that were governing parameters in the compositional process.
Date: December 1999
Creator: Prinz, Kendall R.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

The Luxury of Tears: A Secondary Survivor's Story

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As the written accompaniment for The Luxury of Tears, a twelve-minute documentary video exploring the emotional impact of sexual assault on male survivors and their partners, this document examines the visual texts of both the fiction and nonfiction genres. Specifically, I contend that fiction film manufactures male survivorship with regard to rape events in such manner which contributes to the thematization of social silence. Such silence perpetuates the feminization of rape as a social problem, and dissolves the development of male survivor resources. A discussion of production processes, challenges, and resolutions is included.
Date: December 1999
Creator: McKinney, Kelli
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Measuring Change in University Counseling Center Students: Using Symptom Reduction and Satisfaction with Services to Propose a Model for Effective Outcome Research

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Abstract This study proposes a model for meeting increasingly mandated outcome research objectives in a university counseling center setting. It is proposed that counseling centers utilize their existing intake forms, along with an annual satisfaction survey to determine the effectiveness of counseling services. Effectiveness is defined as improvement and measured by the reduction of the symptoms or presenting concerns with which the client initially presented. It also introduces the Relative-Change Index (R-Chi) as an objective way to quantify intra-individual change occurring as a result of therapy. This new mathematical procedure allows for a more meaningful assessment of the client's degree of improvement, relative to their potential for improvement. By re-administering the problem checklist, routinely included as part of the initial paperwork for each client at intake, again post-therapy, it is possible to quantify improvement by measuring the difference in distressing concerns. Additionally, including a subjective, retrospective survey question asking the client to indicate their perceived rate if improvement at follow-up provides construct validity and allows for correlational comparisons with R-Chi. Results suggest that student/client ratings of the degree to which the services they received satisfactorily addressed their presenting concerns were significantly rated to their R-Chi score. This model suggests that …
Date: December 1999
Creator: Quick, Cynthia L.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Ecological Enhancement of Timber Growth: Applying Compost to Loblolly Pine Plantations

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This study explored the application of compost onto a small loblolly pine tree forest in northeast Texas. Its purpose was to determine if the application of various amounts of compost would provide for accelerated rates of growth for the trees. Soil parameters were also monitored. A total of 270 trees were planted and studied in a northeast Texas forest ecosystem. Compost rates of 5, 25, and 50 tons per acre with either soil or compost backfill were utilized and compared to a control without compost. Nonparametric and parametric ANOVA and Chi-Square tests were utilized. The results indicated that greater application rates retained greater moisture and higher pH levels in the soil. Compost applications also yielded a greater survival rate as well as larger tree height and diameter when compared to the control. The 25 ton/acre application backfilled in native soil achieved the greatest average in height and diameter when compared to the averages for the control plot. Greater growth differences for the 25S application can be attributed to additional nutrients coupled with a stable pH consistent with native soil acidity.
Date: December 1999
Creator: Stuckey, Harold Troy
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Counselor Effectiveness and Correlations With Select Demographic Variables for Masters Level Counseling Students

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Counselor education programs are charged with the responsibility to train students to be effective counselors. Despite relative consistency in academic and clinical experiences, some students are less effective than others. It was the intent of this research to investigate possible relationships which may exist between students' background and experiences and their levels of demonstrated counselor effectiveness as measured by the Counselor Rating Form - Short Version (CRF-S) and the Supervisor Rated-Counselor Interaction Analysis (SR-CIA). It was hypothesized that counselor effectiveness would be negatively correlated with prior teaching experience and level of religious participation. Data was collected using a demographic survey from masters level counseling students participating in their practicum semester. Counseling tapes from each of the participants were collected towards the end of the semester. These tapes were then rated by doctoral students using the CRF-S and the SR-CIA. The total sample size was 28. Regression analysis was used to investigate the hypotheses. Three models were constructed. The dependent variables used were scores from the CRF-S, the SR-CIA and a third comprised of a normalized composite of CRF-S and SR-CIA termed COMPOSITE. Each model used, as the independent variables, years of teaching experience, and hours of religious participation. Results from …
Date: December 1999
Creator: Calhoun, Kenneth
Object Type: Thesis or Dissertation
System: The UNT Digital Library

The Apologist Tradition: A Transitional Period in Southern Proslavery Thought, 1831-1845

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Early antebellum defenders of slavery acknowledged that slavery created problems for southern society. They contended, however, that slave society was better and more natural than other forms of social organization. Thomas R. Dew, William Harper, and James Henry Hammond each expressed a social philosophy in which slavery had a crucial role in preserving social order. They argued from the basis of social organicism, the idea that society should have an elite that controlled the masses. For all three men, slavery represented a system of order that helped balance the dangers of democracy. Significantly, however, all three men recognized that the slave system was not perfect, and despite their defense of slavery, argued that it was a human institution and therefore corruptible.
Date: December 2000
Creator: Austin, Clara
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Practices and attitudes toward alternative medicine among college students.

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This study assesses practices of college students (N=913) toward alternative medicine, relationships of students' health locus of control with practices of alternative medicine, and relationships of students' attitudes toward alternative medicine and health locus of control. A principal components factor analysis established construct validity of the author-designed Attitude Toward Alternative Medicine Scale, extracting three factors: Holistic Attitude/Control, Safety, and Satisfaction. Holistic Attitude/Control predicted use of alternative medicine (Wald =61.9, p < .01). A principal components factor analysis established construct validity of the Multidimensional Health Locus of Control Scale, extracting three factors: Internal Health Locus of Control, External-Chance, and External-Powerful Others. Internal Health Locus of Control significantly correlated with Holistic Attitude/Control (r = .35, p =.01).
Date: December 2001
Creator: Fogle, Peggy
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Chemotactic Response of Lumbricus terrestris Coelomocytes to Larval and Adult Stages of Rhabditis pellio

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Experiments were performed to assess the suitability of Rhabditis pellio, a nematode found in earthworms, as a challenge organism for use in development of a biomarker assay to determine the potential of chemicals to suppress the immunocompetence of the non-specific immune system. To accomplish this goal, information on the life cycle of R. pellio was determined; including effects of incubation time and temperature on growth rates; along with information on the immune response elicited in the earthworm, Lumbricus terrestris. Immune parameters measured were coelomocyte migration toward and attachment to R. pellio larvae and adults. Preliminary background information showed that R. pellio has potential as a challenge organism for development of a biomarker assay.
Date: December 1999
Creator: Medrano, Jennifer Centurion
Object Type: Thesis or Dissertation
System: The UNT Digital Library

When "The Lie Becomes Truth": Four Historiographic Novels of the Twentieth Century

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This dissertation is an exploration of relationships between fiction and history as illuminated by historiographic fiction in general and the historiographic novel in particular. Here the term historiography is employed particularly in several of its many meanings: as the study of the materials and techniques of history, the study of what it means to be a historian, and the study of the philosophy of history. All of these are comprehended in the larger definition of issues pertaining to the writing of history. Four twentieth-century novels are presented and analyzed as historiographic novels. The common element in analysis of all the novels is the examination of historiographic material encoded in narrative, plot, characters, theme, structure or style. Each analysis focuses on one historiographic assumption or problem and brings in perspectives of historians or theorists of history as well as non-novelistic, critical perspectives of the authors themselves. E. M. Forster's Howards End (1910) is analyzed as an imaginative exposé of causality in historical thinking. All the King's Men by Robert Penn Warren (1946) is presented as a gloss on Isaiah Berlin's critique of Leo Tolstoy's second epilogue to War and Peace. Several essays by philosopher Eric Voegelin provide the theoretical framework for …
Date: December 1999
Creator: Detels, Polly Elizabeth
Object Type: Thesis or Dissertation
System: The UNT Digital Library

The Tone Clock: Peter Schat's System and an Application to His Etudes for Piano and Orchestra, Opus 39

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The scope of this study includes relevant background information on Peter Schat and his compositions and process, an explanation of the Tone Clock system and a detailed analysis of one of his compositions, the Etudes for Piano and Orchestra, Opus 39. The intent is to demonstrate how the Tone Clock naturally evolved from the practices of the Second Viennese School and how it relates to both new and existing modern music. The study is divided into five chapters. Chapter 1 presents a brief introduction to Peter Schat and the Tone Clock. Chapter 2 provides a more detailed biography of Peter Schat and traces the development and evolution of his compositional techniques, ultimately culminating in the Tone Clock. Chapter 3 provides a basic explanation of the Tone Clock itself, with demonstrations of various components through musical examples and illustrations. Chapter 4 is a detailed analysis of the Etudes for Piano and Orchestra, Opus. 39. Chapter 5 summarizes the results of the study, with special attention to the impact of the Tone Clock on performance from the perspective of the performer. The analysis of the Etudes was completed by using the Tone Clock as an analytical tool, aided by the composer's original …
Date: December 2002
Creator: Petrella, Diane Helfers
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Richard Thompson Archer and the Burdens of Proprietorship: The Life of a Natchez District Planter

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In 1824 a young Virginia aristocrat named Richard Thompson Archer migrated to Mississippi. Joining in the boom years of expansion in the Magnolia State in the 1830s, Archer built a vast cotton empire. He and his wife, Ann Barnes, raised a large family at Anchuca, their home plantation in Claiborne County, Mississippi. From there Richard Archer ruled a domain that included more than 500 slaves and 13,000 acres of land. On the eve of the Civil War he was one of the wealthiest men in the South. This work examines the life of Richard Archer from his origins in Amelia County, Virginia, to his death in Mississippi in 1867. It takes as its thesis the theme of Archer's life: his burdens as proprietor of a vast cotton empire and as father figure and provider for a large extended family. This theme weaves together the strands of Archer's life, including his rise to the position of great planter, his duties as husband and father, and his political beliefs and activities. Archer's story is told against the background of the history of Mississippi and of the South, from their antebellum heyday, through the Civil War, and into the early years of Reconstruction. …
Date: December 2001
Creator: Hammond, Carol D.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

On the Translation of Binodini's Asangba Nongjabi

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This translator's note is for the translation of Biodini's Asangba Nongjabi (Crimson Rainclouds).
Date: December 2011
Creator: Roy, L. Somi
Object Type: Text
System: The UNT Digital Library

The San Saba Treasure: Legends of Silver Creek

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In 1868, four treasure hunters from San Marcos, Texas, searched for a lost mine on the San Saba River, near today’s Menard. It was popularized as folklore in J. Frank Dobie’s treasure legend classic Coronado’s Children. One hundred and fifty years later, a descendant of one of those four men set out to discover the history behind the legend. This book recounts that search, from the founding of the ill-fated 1757 mission on the San Saba River up to the last attempt, in 1990, to find the treasure in this particular legend. It describes Jim Bowie, a fake treasure map industry, murder trials, a rattlesnake dancer, fortunes lost, a very long Texas cave, and surprising twists to the story popularized by Dobie. The book will not lead anyone to the legendary ten-thousand pounds of silver, but it will open a treasure trove of Texas history and the unique characters who hunted the fabulous riches.
Date: December 2018
Creator: Lewis, David C.
Object Type: Book
System: The UNT Digital Library

Tales of Texas Cooking: Stories and Recipes from the Trans-Pecos to the Piney Woods and High Plains to the Gulf Prairies

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According to Renaissance woman and Pepper Lady Jean Andrews, although food is eaten as a response to hunger, it is much more than filling one's stomach. It also provides emotional fulfillment. This is borne out by the joy many of us feel as a family when we get in the kitchen and cook together and then share in our labors at the dinner table. Food is comfort, yet it is also political and contested because we often are what we eat--meaning what is available and familiar and allowed. Texas is fortunate in having a bountiful supply of ethnic groups influencing its foodways, and Texas food is the perfect metaphor for the blending of diverse cultures and native resources. Food is a symbol of our success and our communion, and whenever possible, Texans tend to do food in a big way. This latest publication from the Texas Folklore Society contains stories and more than 120 recipes, from long ago and just yesterday, organized by the 10 vegetation regions of the state. Herein you'll find Senator Kay Bailey Hutchinson's Family Cake, memories of beef jerky and sassafras tea from John Erickson of Hank the Cowdog fame, Sam Houston's barbecue sauce, and stories …
Date: December 2015
Creator: Vick, Frances Brannen, 1935-
Object Type: Book
System: The UNT Digital Library

Against the Grain: Colonel Henry M. Lazelle and the U.S. Army

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Henry Martyn Lazelle (1832-1917) was the only cadet in the history of the U.S. Military Academy to be suspended and sent back a year (for poor grades and bad behavior) and eventually return as Commandant of the Corps of Cadets. After graduating from West Point in 1855, he scouted with Kit Carson, was wounded by Apaches, and spent nearly a year as a "paroled" prisoner-of-war at the outbreak of the Civil War. Exchanged for a Confederate officer, he took command of a Union cavalry regiment, chasing Mosby's Rangers throughout northern Virginia. Due in part to an ingrained disposition to question the status quo, Lazelle's service as a commander and senior staff officer was punctuated at times with contention and controversy. In charge of the official records of the Civil War in Washington, he was accused of falsifying records, exonerated, but dismissed short of tour. As Commandant of Cadets at West Point, he was a key figure during the infamous court martial of Johnson Whittaker, one of West Point's first African American cadets. Again, he was relieved of duty after a bureaucratic battle with the Academy's Superintendent.
Date: December 2015
Creator: Carson, James O.
Object Type: Book
System: The UNT Digital Library