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Male Habrobracon (a parasitic wasp) were deprived of their antennae and placed in a vial with virgin females for 24 hour periods. Examination of the sex of offspring served as a positive test of whether or not copulation had taken place, since in these insects daughters are biparental offspring...
In a previous study the writer demonstrated an impairment of maze learning ability in rats treated with insulin. Since the steroid extracts of the adrenal cortex are to be considered as insulin antagonists in their action on blood glucose it was thought they might also produce an acceleration of...
The writer presents a mathematical analysis of dynamic systems with special reference to the conditions of stable or steady states. He shows that the stability of parts of a complex dynamic system does not insure an equal degree of stability of the total system. It follows from this that "parts...
The purpose of this experiment was to determine the effect of electro-convulsive shock on a serial light discrimination habit and on the learning of an interference habit. 13 female rats composed the shock group, and 10 rats, half males and half females, the control group. Using a 23-hour hunger...
The writers take exception to a statement by D. Kalish in a recent article on delayed responses in rats "that rats could not to make spatially opposed responses at the same place unless, as in a discrimination problem, there were differential cues at that place which would indicate on each trial...
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