This little book of Mr. Bruce's is written in the author's usual clear and entertaining style. It is a book confessedly for laymen and probably touches the matter of sleep and sleeplessness fairly adequately when that is considered.

In the matter of the theories of sleep the author sticks to good orthodox lines and agrees with Claparède. He elaborates particularly the theories of Sidis, of Coriat, and of Havelock Ellis. He devotes a few words only to the theories of Freud, and although in these words he apparently understands these theories, still the whole book shows that he has failed absolutely to grasp their real significance. He is still disposed to see in a physical stimulus, such as cold feet or disordered digestion, the very important factor in dreams and nightmares, although he distinctly says that the particular content of the dreams and nightmares cannot be thus accounted for.

Perhaps the most characteristic feature of the book is its longest chapter on Dreams and the Supernatural. The reviewer thinks that