This interesting little book will be of interest to all alienists. There are five chapters. Chapter 1 is on Impairments of the Will—Defect of Impulse; Chapter 2, on Excess of Impulse; Chapter 3, on Impairment of Voluntary Attention; Chapter 4, The Realm of Caprices; Chapter 5, The Extinction of the Will, and a Conclusion. The book is interesting, original and scientific. The translation is an excellent one.