. Bulletin of the Department of Agriculture. Agriculture; Agriculture. jfvy^-rt. Joint Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief, and the Bureau of Chemistry, CARL L. ALSBERG, Chief. Washington, D„ C. PROFESSIONAL PAPER August 8,1917 THE PRESENCE OF ARSENIC IN HOPS. By W. W. Stockbbrgbr, Physiologist in Charge of Drug-Plant and Poisonous-Plant Investigations, Bureau of Plant Industry, and W. D. Collins, Food-Investigation Chemist, Bureau of Chemistry. Situation with respect to arsenic in hops. Collection of materials for Analysis of materials CONTE
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. jfvy^-rt. Joint Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief, and the Bureau of Chemistry, CARL L. ALSBERG, Chief. Washington, D„ C. PROFESSIONAL PAPER August 8,1917 THE PRESENCE OF ARSENIC IN HOPS. By W. W. Stockbbrgbr, Physiologist in Charge of Drug-Plant and Poisonous-Plant Investigations, Bureau of Plant Industry, and W. D. Collins, Food-Investigation Chemist, Bureau of Chemistry. Situation with respect to arsenic in hops. Collection of materials for Analysis of materials CONTENTS. Page. Results of analyses. Conclusions Page. 3 7 SITUATION WITH RESPECT TO ARSENIC IN HOPS. At times the detection of minute traces of arsenic in shipments of American hops exported to foreign countries has led to their rejection by prospective purchasers. The loss sustained in such cases is borne by the exporter; consequently American growers, who sell as a rule to local buyers only, do not realize fully the extent to which the salability of American hops on foreign markets may be affected unfavorably by an occasional contaminated shipment. The profitableness of hop production in the United States is deter- mined practically by the extent of the foreign demand for the crop surplus in excess of the requirements for domestic consumption. Any impairment of the quality of American hops, whether definitely proved or only suspected by foreign consumers, lessens the chances for marketing the surplus at reasonable prices and eventually reacts upon the grower in a lower price for his product. Although the probability of any damage to the public health from arsenic com- municated by hops to ale or beer seems very remote, nevertheless the minute quantity of arsenic permissible in hops under some foreign standards of purity lays the grower under obligation to use every reasonable precaution to avoid all possible sources of contamination. In a bulletin published in 1908 by the Burea
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