As regards the classifications of amnesia M. Sollier censures that of M. Ribot as being neither openly psychological nor openly clinical, and of taking successively as bases the extent of an observed phenomenon, its evolution, its location in time. Moreover, from a clinical standpoint it has led to a joining together of totally incongruous disorders. M. Sollier therefore rejects it, and contents himself with adopting first of all, with M. Falret, the natural classification of general amnesia and of partial amnesia. Moreover, in taking account of the systematising of lost remembrances, he proposes to make a distinction as to the two varieties of systematised (functional) and of non-systematised (organic) amnesia, considered from the purely psychological standpoint, p. 59. We should thus have, firstly, the classification of general amnesia, including (A) true organic amnesia (destruction of the centre of mental images), and, under the classification of the systematised, (B) functional, or apparent, amnesia (imperfect performance of the functions of the centres): this latter subdividing into two groups, (_a_) amnesia with its varieties (_a´_) simple, (_b´_) retrogressive, (_c´_) progressive, and (_b_) paramnesia: (_a´_) that of locality, (_b´_) that of exactness; to which it is proper to add (_c_) dysmnesia, which is organic-functional. Secondly, the classification of partial amnesia whether systematised or not, which may be either organic or functional. M. Sollier abandons, moreover, every pathological or etiological classification as being exceedingly unsatisfactory. In the presence of a patient, he justly remarks, the physician can only employ semiology.—I will not enter here into the details of the inquisitor-like investigation entered upon by the author. I must even proceed without stopping through the observations intended for medical men, which form the second part of the work, but I judge that every reader will also find therein many facts which may prove of interest. After having read it, one is more impressed than ever with the importance and delicacy of the motive forces of the memory, in noting the frequency and the varieties even of its sources of weakness. M. Sollier has the credit of pointing them out—in the shape of “defects in synthetical power” and in “will power”—in the sources of weakness where one had not been accustomed to look for them. It would be interesting, he thinks, to find out what part amnesia may perhaps take in the pathogeny of certain nervous disorders, and the influence which it has on their evolution. Specialists for the insane might find therein a new subject of study, and psychology will profit, on the other hand, by that which clinical experience offers it. Is not its main object to learn to understand life as a unit at the same time that it analyses it as a diversity? * * * * *