AM happy to recommend to the medical public the book of one of my pupils, M. Pierre Janet, on the mental state of hystericals. These studies, begun a long time ago, have been completed in my'service and set forth in a few lectures which M. Janet delivered this spring at the Salpétriere. They confirm a thought often expressed in our lectures, namely, that hysteria is largely a mental malady. This is one of the features of this malady we should never neglect if we wish to understand and treat it.