This is a history book. Pascal who said that the last thing an author does in making a book is to discover what to put at the beginning. This discovery is easily made in the present instance, I wish to state that the range of this book, as its title implies, is mainly restricted to the salient points of the historical sketch it attempts to pourtray. To have written a complete History of the Insane in the British Isles would have necessitated the narration of details uninteresting to the general reader. Hence, as the periods and the institutions of greatest importance have alone been brought into prominence, others have been inevitably thrown into the shade.