rangiferinus_, which is the ordinary food of the rein deer, is a more substantial nutriment than the leaves, bark, or buds of trees, on which the common stag feeds, it is not wonderful that the former should have a greater redundance of organic nutriment, and consequently more fat and larger horns than the latter. It must be allowed, however, that the organic matter, which produces these horns, is not entirely separated from inanimate particles, but preserves even after it has passed through the body of the animal, characteristics of its former vegetable state. The horns of the stag in their make and growth resemble the branches of a tree; and its substance is perhaps more of the nature of wood than bone; it is, as it were, a vegetable grafted upon animal, partaking of the nature of both, and forms one of those shades by which nature always approximates to the two extremes. In animals the bones grow at the two extremities at the same time, at first becomes hard in the middle, and at the two ends continue soft and receding therefrom until it has acquired its full length. In vegetables, on the contrary, the wood advances by one extremity only; the bud which unfolds to form a branch is only attached to the old wood by its lower end, and it is from this point that it exerts its power of extension in length. This remarkable difference between the growth of bones and the solid parts of plants, does not take place in the horns of the stag, as nothing can bear a stronger resemblance to their growth than that of a branch of a tree; they extend from one extremity only, they are at first as tender as an herb and then harden like wood. The scurf which covers and grows with them is their bark, which the animals rub off when they are arrived at their full growth; until this is completed the ends remain soft, and likewise divide themselves into a number of branches. In a word there is a perfect resemblance in the development of both, and therefore the organic molecules, which constitute the living substance of the horns of the stag, still retain the image of the vegetable, because they are arranged in the same manner as in vegetables. Here we see that matter has an influence over form. The stag, which lives in the forest, and feeds only on the leaves of trees, receives from them so strong an impression that he produces a sort of tree, of whose origin it is impossible to mistake. This effect, though surprising, is not singular, but depends on that general cause which we more than once have already had occasion to point out.