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number also, and the philosophers find in the new fact proof of a growing power of calculation. The crow learns by experience to fear man, that is to connect danger with certain perceptions. In rare cases, under protracted experience and varied discipline, he might carry this association two steps farther, to three definite, closely united impressions; a hut, the entrance of three, the departure of two. This experience, provoking alarm in him, would extend by admonition to others, and would at once receive the interpretation above given. We find it very difficult not to attribute to such actions the same degree of thought and intelligence which would be indicated by them in us. Yet this tendency should be easily overcome, when we remember that we are compelled to cover up by the word instinct actions which in man would show the most wonderful knowledge and skill. It is certainly no very strange thing, that three perceptions should, in the ready memory of a crow, alert and watchful, by life-long instinct and habit directing its attention to like facts, find at length a fixed association with danger.

It is narrated, that a raven hit upon this method of defrauding a dog of a portion of his dinner. The raven would approach so near and so annoyingly as to provoke pursuit. This pursuit would draw the dog from the dish, and the raven, quick of wing, would immediately rise and pounce down -on the unguarded meal. Observe how easily such a series of associations would be formed, the acts constituting it finding union and undesigned repetition in experience till they became a habit apparently shaped on a rational purpose. Impelled by hunger, the raven would naturally approach the dog as near as he dare venture; the dog as naturally would resent the- intrusion. The raven, pressed by pursuit, and rising on the wing, would see the unprotected dish, and at once pluck a portion of the coveted food. This