This paper establishes a basis for abelian categories, then gives the statement and proof of two equivalent definitions of an abelian category, the development of the basic theory of such categories, and the proof of some theorems involving this basic theory.

The problem of this study was to evaluate Denton State School's Developmental Evaluation Form as it is now being used in their operant conditioning techniques in certain basic self-help areas, and to suggest a more effective and informative method of scoring the Evaluation Form. The present method of scoring this evaluation form requires that -all items at each developmental level be passed in order to receive credit for that level. No partial credit is given at any level. This method of scoring yields a developmental level at which. the individual is functioning. It does not, however, point out the total overall development of the individual. The present type of basal developmental scoring is not as discriminating as far as picturing an individual's total development as the one which will be suggested.

The purpose of this study was to find if memory load significantly affects the performance of the subjects in the before condition of a before versus after technique experiment. In order to accomplish this the alternatives were presented either before or after the stimulus, with the alternatives and stimuli being either of high-complexity or low-complexity.

The problem of this study was to determine the relationship between the nature of an individual's self-concept and belief system to his orientation toward internal versus external control of reinforcement. This study was designed to investigate the relationship of two variables, self-concept and open versus closed belief system, to a third variable, locus of control.

The design of this experiment was developed to investigate the presence of success-striving and failure-avoidant motivational patterns in the level of aspiration behavior of retarded subjects. The primary objective of this study is to show that success-strivers are present in mentally retarded groups, even if in the minority.

A comprehensive study of all nineteenth-century New Orleans composers is far beyond the scope of this paper. There are simply too many. An attempt has been made, however, to include as many possible in the text. Others, about whom there is insufficient information to include in a narrative, have been relegated to the appendix, where they are treated in the style of a biographical dictionary. The two most important and influential composers of the century, Gregorion Curto and Theodore von La Hache, are covered individually in chapters two and three, respectively. Their music represents all three of the important aspects of composition of the era: opera, salon, and sacred music. Louis Moreau Gottschalk, probably the most famous composer and performer of the period, has been omitted from this study (other than incidental references) because he has already received considerable attention from numerous other researchers. Likewise, another composer of note, Ernest Guiraud, has been omitted because, even though a native of New Orleans, he left America at an early age and never returned. He should more appropriately be considered in annals of French music. Research in this field, a vital part of the American musical heritage, is by no means complete. …

The problem with which this investigation was concerned was to determine whether or not fear of death was related to positive future time perspective and self-esteem.

The purpose of this study is to conduct an examination of the concept of comprehensive health planning the type of which is mandatory if society is ever to realize comprehensive health services for the multitude of people in that society.

In music, the term verismo usually refers to a realistic or naturalistic movement in Italian operas of the late nineteenth century. From the dawn of Italian opera four features have been manifested--umanita (humanism), sincerity (sincerity), passione (passion), effetto (not only theatrical effect but the supreme dramatic moment). The elements of verismo are among the characteristics present in the operas of Giuseppe Verdi where they reached a zenith of development. It is upon these veristic aspects, as identified in the second chapter, that the operas Cavalleria Rusticana and Pagliacci were based. Rigoletto, Il Trovatore, and La Traviata richly exhibit these elements of verismo which have been identified in the fourth chapter.

Don Juan was Byron's effort to come to terms with the reality of his own environment, and he demanded the liberty to try to understand life and to present his conclusions without editorial or social oppression. It is an examination of the problem of appearance and reality; as a satire, the poem attacks appearances maintained by hypocrisy by placing them against the background of reality which is apparent to Byron.

The English horn has a background of historical confusion because the instrument was built in many different shapes and was given a new name for each change of form.

This study was designed to identify the knowledge and skills that draftsmen employed in the greater Dallas-Forth Worth, Texas metropolitan area should posses. This study was conducted to identify the following as related to draftsmen in the Dallas-Forth Worth, Texas area: What kind of education and experience is required to prospective draftsmen? What are the general duties of draftsmen? How much emphasis is placed upon knowledge of and skill in the use of drafting equipment? How important are the basic concepts and principles of drafting usually taught in drafting courses? What methods are used to reproduce drawings?

The object of this study was to compile a list of solo literature for beginning college voice students and analyze these solos for pedagogical and performance purposes. There is no lack of printed material on the subjects of singing and voice culture. But it is not readily accessible to teachers since it is extremely diversified and rather diffusely distributed throughout a variety of sources, such as books, periodicals, and scientific papers. Several lists and books containing songs for beginners have been compiled.

This paper will examine Chekhov's attitudes toward love and marriage as revealed in his short stories. An attempt will be made to find certain themes which recur frequently and to discover the reasons for their recurrence.

It is the purpose of this paper to make a general study of David Belasco's use of naturalism in the American theatre. More specifically, it is to determine Belasco's methods of achieving naturalism in his stage settings and lighting. From the study of his techniques and methods, and effort is made to establish his contributions to the naturalistic movement.