The Role of the Circulatory and Nervous Systems in the Toxic Action of Parathion1

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Abstract
In tests on the American roach, Periplaneta americana, sectioning the ventral nerve cord at various intervals following treatment indicated that the ventral nerve cord was involved in the transport of parathion, and that the knockdown time decreased as the time between treatment and nerve tissue removal increased. The relative capacity of several tissues in the roach to absorb parathion in vivo following topical applications were detd. microanalytically. Parabiotic connections between 2 roaches were made with the blood as the only tissue contact. Parathion applied topically to one insect was detectable in the other roach at knockdown. The ventral nerve cord is more effective than the blood in translocating the toxic principle, probably some toxic metabolite.

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