Abstract
Responses due to stimulations of chemoreceptors on the tarsi and proboscis with HgCl2, NaF, Na fluosilicate, ar-senious acid and arsenic acid in sucrose solns. showed concs., of 0.025% HgCl2 and 055% arsenic acid to be repellent. Conc. of 3.5% NaF, 0.5% Na fluosilicate, and arsenious acid (184 g. AS 2O3 per 100 cc.) were not repellent. Strong conc. of HgCl2 had an inhibitory effect on the chemoreceptors.

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