Abstract
A certain amount of error in making blood cell counts in the cockroach, Blatta orientalis L., is caused by the rapid coagulation of the blood of the insect. Rapid coagulation also causes error in blood cell counts of other species of cockroaches, (Yeager and Tauber, 1932). These authors, in determining the total blood volume of the cockroach by the corpuscle dilution method, found that the error due to uncontrolled coagulation averaged about 14 percent. Shull, Riley and Richardson (1932) and Shull and Rice (1933) have shown that coagulation of the blood of the cockroach can be inhibited by treating the insects with glacial acetic acid vapor. Data presented in this paper show the effect of such inhibition on the blood cell count in the cockroach, Blatta orientalis L.
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