. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN OF THE in No. 76 Contribution from the Bureau of Animal Industry, A. D. Melvin, Chief April 29, 1914. (PROFESSIONAL PAPER.). LABORATORY AND FIELD ASSAY OF ARSENICAL DIPPING By Robert M. Chapin, Senior Biochemist, Biochemic Division. INTRODUCTION. The use of arsenical dipping fluids for the treatment of cattle infested with Texas-fever ticks is increasing. A mixture termed by the Bureau of Animal Industry "standard arsenical solution" is pre- pared from white arsenic, sal soda, and pine tar,
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN OF THE in No. 76 Contribution from the Bureau of Animal Industry, A. D. Melvin, Chief April 29, 1914. (PROFESSIONAL PAPER.). LABORATORY AND FIELD ASSAY OF ARSENICAL DIPPING By Robert M. Chapin, Senior Biochemist, Biochemic Division. INTRODUCTION. The use of arsenical dipping fluids for the treatment of cattle infested with Texas-fever ticks is increasing. A mixture termed by the Bureau of Animal Industry "standard arsenical solution" is pre- pared from white arsenic, sal soda, and pine tar, and is largely used for both official and private dipping operations. Proprietary dipping- fluids also have appeared on the market to some extent. Previous publications 2 of the bureau contain directions for the preparation of "standard arsenical solution," together with general information of importance to users of arsenical dips. During the last few years wide practical experience of the bureau with all kinds of arsenical dips in the field has shown with increasing forcefulness that one of the greatest obstacles to the successful use of these preparations, and consequently to the effective prosecution of the tick-eradication work now progressing so well over considerable areas, lies in the uncertainty attached in many cases to the composi- tion of these dips. There is no doubt that arsenical baths, properly prepared and used, are very effective tickicides and cause little injury to cattle. But the Texas-fever tick is a resistant organism. Destruction only follows its immersion in rather strong solutions of arsenious oxid, so strong in fact that if made only a little stronger the cattle themselves will begin to show effects. That is, the margin of safety within which solutions of this violent poison may be satis- factorily used is rather narrow. Too little fails to kill the ticks; too much injures the cattle. In either case the cause of tick eradication 1 A popular a
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