Published online by Cambridge University Press: 10 July 2009
The object of the present work is to study the histological picture of the intestinal tube of insects when subjected to the action of insecticides, in order to discover the mechanism of the action of poisons on insects.
* These experiments in poisoning insects were conducted by the following scientific workers of the Institute for Plant Protection: B. Dadonov, Mme. E. Skriabin, and Mme. A. Voskresensky, whose valuable assistance is here gratefully acknowledged by the author.
* Plant Protection (formerly La Défense des Plantes), 6, nos. 1 & 2, 1929.
* The above-mentioned histological data for locusts seem to me to be insufficient for a comparative evaluation of the toxic properties of sodium arsenite and sodium silicofluoride. According to the latest toxicological observations, the limit of lethal zones with respect to locusts is represented for sodium arsenites by doses of 0·029 mgr. per 1 gr. of live weight of insect, and for sodium silicofluoride by 0·34 mgr. The doses used in the above-described experiments are therefore not exactly commensurate with one another, and the histological pictures may present discrepancies and not correspond wholly with one another. Additional experiments and tests with new materials are necessary for the subject in question to be wholly elucidated.