The first lesson of philosophic discipline is to wean the student’s attention from the degrees of things, which alone form the vocabulary of common life, and to direct it to the kind abstracted from degree. Thus the chemical student is taught not to be startled at disquisitions on the heat in ice, or on latent and fixible light. In such discourse the instructor has no other alternative than either to use old words with new meanings (the plan adopted by Darwin in his Zoonomia;) or to introduce new terms, after the example of Linnaeus, and the framers of the present chemical nomenclature. The latter mode is evidently preferable, were it only that the former demands a twofold exertion of thought in one and the same act. For the reader, or hearer, is required not only to learn and bear in mind the new definition; but to unlearn, and keep out of his view, the old and habitual meaning; a far more difficult and perplexing task, and for which the mere semblance of eschewing pedantry seems to me an inadequate compensation. Where, indeed, it is in our power to recall an unappropriate term that had without sufficient reason become obsolete, it is doubtless a less evil to restore than to coin anew. Thus to express in one word all that appertains to the perception, considered as passive and merely recipient, I have adopted from our elder classics the word sensuous; because sensual is not at present used, except in a bad sense, or at least as a moral distinction; while sensitive and sensible would each convey a different meaning. Thus too have I followed Hooker, Sanderson, Milton and others, in designating the immediateness of any act or object of knowledge by the word intuition, used sometimes subjectively, sometimes objectively, even as we use the word, thought; now as the thought, or act of thinking, and now as a thought, or the object of our reflection; and we do this without confusion or obscurity. The very words, objective and subjective, of such constant recurrence in the schools of yore, I have ventured to re-introduce, because I could not so briefly or conveniently by any more familiar terms distinguish the percipere from the percipi. Lastly, I have cautiously discriminated the terms, the reason, and the understanding, encouraged and confirmed by the authority of our genuine divines and philosophers, before the Revolution. ------both life, and sense, Fancy and understanding; whence the soul Reason receives, and reason is her bring, Discursive or intuitive: discourse [32] Is oftest yours, the latter most is ours, Differing but in degree, in kind the same.