CHANGES IN ELECTRICAL POTENTIAL IN NORMAL, CASTRATED, AND THEELIN-TREATED RATS

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Abstract
With the use of the Burr-Lane microvoltmeter it was found that a definite electrical potential pattern is associated with the oestrous cycle of the rat. Normally, during late oestrus, there is a great increase in the difference in electrical potential between the vagina and the symphysis pubis, followed by comparatively low readings until oestrus again occurs. The cyclic type of electrical curve, abolished after removal of the ovaries and during pseudopregnancy, is replaced by one which is quite patternless. When threshold quantities of theelin are given, the electrical detns., when plotted, form a curve similar to that of the normal animal.

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