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Much has been written upon the subject of sight, but Professor Joseph Le Conte makes good his claim to add to this kind of literature. His book is a model of clear exposition, rich in information, and abounding in views or modes of exposition which are more or less novel. After a short introduction on the relation of the senses to general sensibility, and the different relations of the senses to their environment, the first part of the book, which treats of monocular vision, commences with an account of the structure of the eye, terse and admirably clear. Then, having got the instrument, its use is demonstrated in the formation of the image. The eye is considered as an optical instrument; he then points out its defects, such as short-sightedness, long-sightedness, and the sight of old age. The fourth chapter explains the phenomena of monocular vision, entering into a consideration of the function of the rods and cones of the retina, but less fully than in the better works on physiology published 'in this country. The second part of the book is devoted to binocular vision, and discusses judgment of distance, size and form, binocular perspective, double images, and the superposition of images. The third part is on disputed points in binocular vision. This latter part is to some extent original in character. The bright interesting tone of the exposition is never lost, and the subject is kept so free from technicality that, whatever may be the differences of opinion concerning certain theories discussed, the work must be accepted as a useful contribution to scientific literature. -The Westminster Review, Vol. 116

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