Summary1Two types of apparatus for exposing insects to known concentrations of toxic gases, under controlled conditions, were constructed and are described.2The relative resistance of different stages of the flour beetle, Tribolium confusum Duv., to hydrogen cyanide was determined, the results being treated by Bliss's method. The order of resistance was pupa (most resistant), adult, larva, egg. The difference in resistance at different ages was found for the pupa, adult and egg. The application to all these results of Cotton's theory of the relation of rate of metabolism and susceptibility to fumigants is discussed. It is considered that this theory might hold for stages other than the egg.3A series of experiments was carried out to discover whether individual resistance to hydrogen cyanide was inherited. It was found that the offspring of resistant individuals were significantly more resistant than the offspring of susceptible individuals, and that this difference was maintained over

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toxic gases rate of metabolism beetle fumigants cyanide conditions hydrogen

H. C. GOUGH,.FACTORS AFFECTING THE RESISTANCE OF THE FLOUR BEETLE, TRIBOLIUM CONFUSUM DUV., TO HYDROGEN CYANIDE. 26 (3),533-571.

H. C. GOUGH,"FACTORS AFFECTING THE RESISTANCE OF THE FLOUR BEETLE, TRIBOLIUM CONFUSUM DUV., TO HYDROGEN CYANIDE" 26

H. C. GOUGH,"FACTORS AFFECTING THE RESISTANCE OF THE FLOUR BEETLE, TRIBOLIUM CONFUSUM DUV., TO HYDROGEN CYANIDE"