Abstract: On the basis of previous work this study deals with the effectof electrolytic destruction of,mammillary body or septum on saccharinaversion learning of rats. The results show that the destruction of mammillary body orseptum caused no deterioration of the establishment of conditionedsaccharin aversion. The persistence of its memory trace was notimpaired either. This result is the same as that of the previousexperiment, and seems to indicate that memory of the sense of smellhardly depends on the action of the mammillary body, hippocampusand septum that link the. loops. concerned.

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