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ctly so. Hence he proceeds to prove that those which he calls primary qualities are indeed part of the essence of the body, and characteristic of it; but that the two other kinds of qualities which together he calls secondary, are neither of them more than _powers_ of producing on other objects, or in us, certain effects and sensations. Now a power of influence is always equally characteristic of two objects--the active and passive; for it is as much necessary that there should be a power in the object suffering to receive the impression, as in the object acting to give the impression. (Compare Locke, Book ii. chap. 21, sect. 2.) For supposing two people, as is frequently the case, perceive different scents in the same flower, it is evident that the power in the flower to give this or that depends on the nature of their nerves, as well as on that of its own particles; and that we are as correct in saying it is a power in us to perceive, as in the object to impress. Every power, therefore, being characteristic of the nature of two bodies, is imperfectly and incompletely characteristic of either separately; but the primary qualities, being characteristic only of the body in which they are inherent, are the most important truths connected with it. For the question, what the thing _is_, must precede, and be of more importance than the question, what can it do. Sec. 3. Color is a secondary quality, therefore less important than form. Now by Locke's definition above given, only bulk, figure, situation, and motion or rest of solid parts, are primary qualities. Hence all truths of color sink at once into the second rank. He, therefore, who has neglected a truth of form for a truth of color, has neglected a greater truth for a less one. Sec. 4. Color no distinction between objects of the same species. And that color is indeed a most unimportant characteristic of objects, will be farther evident on the slightest consideration. The color of plants is constantly changing with the season, and of everything with the quality of light falling on it; but the nature and essence of the thing are independent of these changes. An oak is an oak, whether green with spring or red with winter; a dahlia is a dahlia, whether it be yellow or crimson; and if some monster-hunting botanist should ever frighten the flower blue, still it will be a dahlia; but let one curve of the petals--one groove of the stamens be wanting, and the flower
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