Originally published in 1921, this book contains a number of observations on 'stupors' relating to dementia praecox and manic-depression. Hoch completed much of the manuscript before his death in 1919, and the text was finished by celebrated psychologist John T. MacCurdy. Hoch's conclusions are furnished by multiple examples from case studies taken from his time as director of the Psychiatric Institute of the New York State Hospitals from 1910 to 1917. This book will be of value to anyone with an interest in the history of psychiatry and the historical treatment of manic-depression and dementia.