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The phenomenon of old age and the various psychopathologic problems connected with it occupies a place of no little importance in the field of psychiatry. In the study of the so-called senile psychoses a great mass of anatomopathologic observations have been collected recently, but we are still far from a consensus of opinion as concerns the pathogenetic interpretation of some of the most important symptoms, and we are unable to make a definite nosographic classification. It is conceded by the author of this book, who admits, in spite of all his researches, that we still have to rely on clinical observations rather than on the histopathologic findings for the diagnosis of senile dementia. The book has two parts, one being a critical review of the facts already known of the pathology of the senile psychoses and their symptomatologic relationship, giving the opinions of the different psychiatric schools on the subject