Now I wish particularly to impress upon the reader that all these sensations of beauty in the plant arise from our unselfish sympathy with its happiness, and not from any view of the qualities in it which may bring good to us, nor even from our acknowledgment in it of any moral condition beyond that of mere felicity; for such an acknowledgment, belongs to the second operation of the theoretic faculty (compare Sec. 2,) and not to the sympathetic part which we are at present examining; so that we even find that in this respect, the moment we begin to look upon any creature as subordinate to some purpose out of itself, some of the sense of organic beauty is lost. Thus, when we are told that the leaves of a plant are occupied in decomposing carbonic acid, and preparing oxygen for us, we begin to look upon it with some such indifference as upon a gasometer. It has become a machine; some of our sense of its happiness is gone; its emanation of inherent life is no longer pure. The bending trunk, waving to and fro in the wind above the waterfall, is beautiful because it is happy, though it is perfectly useless to us. The same trunk, hewn down and thrown across the stream, has lost its beauty. It serves as a bridge,--it has become useful; it lives not for itself, and its beauty is gone, or what it retains is purely typical, dependent on its lines and colors, not on its functions. Saw it into planks, and though now adapted to become permanently useful, its whole beauty is lost forever, or to be regained only in part when decay and ruin shall have withdrawn it again from use, and left it to receive from the hand of nature the velvet moss and varied lichen, which may again suggest ideas of inherent happiness, and tint its mouldering sides with hues of life. There is something, I think, peculiarly beautiful and instructive in this unselfishness of the theoretic faculty, and in its abhorrence of all utility which is based on the pain or destruction of any creature, for in such ministering to each other as is consistent with the essence and energy of both, it takes delight, as in the clothing of the rock by the herbage, and the feeding of the herbage by the stream. Sec. 6. Especially with respect to animals. Sec. 7. And it is destroyed by evidences of mechanism.