Volume provides abstracts of agricultural experiments conducted during the year. Also includes statistics, convention reports, bulletins, bibliographies, and listings for Spanish edition publications from the Puerto Rico station. Name and subject indexes start on page 867.

"A convenient method has been developed for determining the scavenging efficiency or the charging efficiency of two-stroke-cycle engines. The method consists of introducing a suitable tracer gas into the inlet air of the running engine and measuring chemically its concentration both in the inlet and exhaust gas. Monomethylamine CH(sub 3)NH(sub 2) was found suitable for the purpose as it burns almost completely during combustion, whereas the "short-circuited" portion does not burn at all and can be determined quantitatively in the exhaust" (p. 1).

Report issued by the U.S. Bureau of Mines on the annual work conducted by the Mining Division during 1942. Descriptions of projects and operations during the fiscal year are listed. This report contains tables, and photographs.

From introduction: The Red Bluff Bay area was examined briefly for the Geological Survey by John C. Reed and others in 1939. During the summer of 1941 the writers, with R. E. L. Rutledge, mapped this area on a scale of 1:12,000, and examined the serpentine masses in the interior during the course of reconnaissance trips into the surrounding region.

Report issued by the U.S. Bureau of Mines on testing of sub-audible noises and accuracy of rock burst predictions. The history of this study, and the results of these investigations are presented. This report includes tables, graphs, illustrations, and diagrams.

Discusses methods for maintaining grazing pastures, enriching the soil, and preventing the erosion of soil.

Discussing Vanadium-bearing phosphatic shale produced in West-central Wyoming and Southeastern Idaho

Report issued by the U.S. Bureau of Mines discussing the use of mineral pigments. The importance of pigments is presented along with a description of import and export trends of minerals. This report includes tables.

Monthly report documenting orders, opinions, and other legal statements issued by the Office of the Attorney General in Texas.

Annual report submitted by the Boy Scouts of America to Congress describing highlights from 1941, ideals, service and business reports, activities, organizational leadership, and other information about scouting programs.

Volume provides a summary of the progress of each agricultural experiment station. Also includes statistics and selected studies.

Bulletin discussing

Preface: The author of this paper gives a thorough description of a complex of very unusual igneous rocks and associated hydrothermal deposits.