Abstract
Stomach Poisons ONE of the most important recent events affecting the use of arsenical compounds for controlling insects on fruits and vegetables is the change in the official tolerances for arsenic and lead. Effective August 10, 1940, the Federal Security Agency ( 9 ) has ruled that the tolerance for lead shall be increased to 0.05 grain Pb per pound of produce and that of arsenic to 0.025 grain As (as AS 2 O 3 ) per pound. The fluorine tolerance remains unchanged as of 1938 at 0.02 grain F per pound. These tolerances are subject to change if methods for evaluating the toxic effects of lead and arsenic on human beings are improved. Although this action may reduce somewhat the care necessary in applying sprays and dusts and in removing the residues, it will not halt the search for new insecticides less toxic to humans and more efficient than the compounds of lead, arsenic, and fluorine now in use. Several ...
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