INSTINCT IN ANIMALS AND INTELLIGENCE IN MAN CONTRASTED.WITH AN EXAMINATION OF DARWIN'S DICTUM OF THE "MISSING LINK" AND LINNÆUS' DOGMA "NATURA NON FACET SALTUS," WITH A FEW ORIGINAL OBSERVATIONS THEREON. Read by Title in the Section of Medicine and Physiology at the Forty-Second Annual Meeting of the American Medical Association, heldal Washington, D, C, May 5, 1891.

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ABSTRACT in animals is a matter of daily observation by every class of mind, and has always been a subject of great interest, nevertheless it seems still little understood. Writers in psychology are not yet agreed even upon its definition.Ribot, a modern French writer, says it embraces those psychological phenomena occurring in animals, and all forms of mental activity, inferior to those in men. A German contemporary says It is an act conformed to an end, but without consciousness of that end. Darwin's definition is more elaborate, but scarcely more definite; by reason of its length it is more open to criticism. He says Instinct is an action which we otherwise would require experience to perform, when performed by an animal, more especially by a very young one, without any experience, and when performed by many individuals in the same way without their knowing for what