Abstract
Only a few of the toxic gases used in this study produced a visible effect upon the process of blood coagulation, or upon the blood cells of Periplaneta orientalis, or brought about readily visible chemical changes in its blood. Roaches which were killed with carbon disulphide yielded a small quantity of blood poor in cells; those killed with pyridine also yielded little blood but the cell content was apparently normal. The blood of roaches, which were killed with acetic acid vapor, did not coagulate and the cells were fixed in an apparently normal condition. Crystals or magnesium ammonium phosphate appeared in the blood of the roaches which succumbed to ammonia gas. As these were the only effects observed in the blood of roaches treated with 34 inorganic and organic compounds of widely differing physical properties and chemical composition, it is probable that lethal concentrations of most gaseous compounds do not produce marked visible changes in the blood of this insect.
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