Abstract
The results of the determination of blood volume in the American cockroach, Periplaneta americana (L.), reported in another paper (2), gave rise to the question—What changes would blood volume and blood chloride undergo if roaches were injected with different concentrations of sodium chloride solution? Partial answers to this and certain other questions are provided by experiments reported here, in which blood volume and total chloride in American roach nymphs were measured at different time intervals after they had been injected with different concentrations of sodium chloride solution. The results support the suggestion made previously in a study of the mode of insecticidal action of sodium metarsenite (3), that the injection of a higher concentration of sodium chloride into a roach would favor the retention of more water by the blood.
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