. Department bulletin. Agriculture; Agriculture. Washington, D. C. ? June 9,1923 CHEMICAL, PHYSICAL, AND INSECTICIDAL PROPERTIES OF ARSENICALS. By F. C. Cook, Physiological Chemist, Insecticide and Fungicide Laboratory, Miscel- laneous Division, Bureau of Chemistry, and N. E. McIndoo, Insect Physiologist, Fruit Insect Investigations, Bureau of CONTENTS. Page. Purpose of investigation 1 Arsenicals studied 1 Chemical properties ot arsenicals 2 Physical properties of arsenicals 20 Comparative toxicity of arsenicals 24 G eneral properties of arsenicals 50 Summary 53 Literature cited 5
. Department bulletin. Agriculture; Agriculture. Washington, D. C. ? June 9,1923 CHEMICAL, PHYSICAL, AND INSECTICIDAL PROPERTIES OF ARSENICALS. By F. C. Cook, Physiological Chemist, Insecticide and Fungicide Laboratory, Miscel- laneous Division, Bureau of Chemistry, and N. E. McIndoo, Insect Physiologist, Fruit Insect Investigations, Bureau of CONTENTS. Page. Purpose of investigation 1 Arsenicals studied 1 Chemical properties ot arsenicals 2 Physical properties of arsenicals 20 Comparative toxicity of arsenicals 24 G eneral properties of arsenicals 50 Summary 53 Literature cited 55 PURPOSE OF INVESTIGATION. A study of the chemical, physical, and. insecticidal properties of arsenicals on the market was undertaken in order to gain a better understanding of them, to be able, if possible, to improve them, and to produce new arsenicals for insecticidal purposes. The results of this investigation, which was conducted by the Bureau of Chemistry and the Bureau of Entomology of the United States Department of Agriculture, are here reported. ARSENICALS STUDIED. Paris green and lead arsenate, which have been standardized and found reliable for many years, have constituted the principal in- secticides used against external chewing insects. However, during the past few years, the use of calcium arsenate has steadily in- creased, owing in part to the discovery that it is effective in combating the boll weevil. The manufacture of calcium arsenate, although well beyond the experimental stage in most factories, probably will not be completely standardized for several years. Because of the im- portance and recent large-scale production of calcium arsenate, many of the results in this bulletin deal with comparisons of calcium arsenate and acid lead arsenate. 1 The following assisted in this work: R. Elmer, W. A. Gersdorff, R. JinMns, B. Neuhausen, and A. Schultz, Junior Chemists, Insecticide and Fungicide Laboratory, Bureau of Chemistry, and W. A. Hoff- man. Scientific As
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