The author of this book is like an awkward angler, who fails to take a trout himself, and spoils the water for the more skilful man who may follow him. Its object is the illustration of that subject which has been called "the greatest of our social evils," and which, in its present aspect, is certainly one of the saddest that the statesman or the moralist is called upon to contemplate, and yet one the duration of which seems to be inevitably coexistent with every form of civilized society yet known to the world. The author has sought his end by means of a fictitious autobiography. This was of course. No unusual faculty in the selection of methods was necessary to the choice; for only in the autobiographical form could the inner life of a courtesan be so revealed as to present a truthful and living picture of her soul's experience. A fine novel of this kind would be a great book, and one productive of much good; not, indeed, directly to the wretched class that would furnish studies for it, but to society at large, and so indirectly to the class in question, by providing a subject of this kind which could be studied and talked about. Dumas _fils_' "Dame aux Camelias" is a great melodramatic story; but it is so exceptional in its incidents and episodical in its character, that its heroine is quite worthless as a specimen for examination and analysis; and it is, beside, so very French as to be almost valueless in this regard, for that reason alone. What it would be well to have written is the story of an abandoned woman, told simply and without any reserve, except that of decency, and purely from a woman's point of view. But, except by a woman, and at the cost of the experience to be recounted, this is manifestly possible only to genius. The author of "Out of the Depths" has not attained the _desideratum_; but has yet approached so near it, that we fear the right man, or, possibly, woman, may be deterred from the attempt to do better. If so, there is a good subject--good for the making of a grand psychological, physiological, and dramatic study--lost.