hich produces them, or to avoid it. This active or vivid class of ideas comprehends the passions. The functions of the mind here described, exist then in different forms and degrees, from the simple idea, to the highest energy of passion: and the terms, thought, sentiment, emotion, feeling, and passion, are but the verbal signs of these degrees and forms. Nor does there appear to be any line of classification, for separating thought from passion: since simple thoughts, without changing their nature, do, from interest or incitement, often assume the colour of passion."--Philosophy of the Human Voice, p. 328.
4. Lord Kames, in the Appendix to his Elements of Criticism, divides the senses into external and internal, defining perception to be the act by which through the former we know outward objects, and consciousness the act by which through the latter we know what is within the mind. An idea, according to his definition, (which he says is precise and accurate,) is, "That perception of a real object which is raised in the mind by the power of memory." But among the real objects from which memory may raise ideas, he includes the workings of the mind itself, or whatever we remember of our former passions, emotions, thoughts, or designs. Such a definition, he imagines, might have saved Locke, Berkley, and their followers, from much vain speculation; for with the ideal systems of these philosophers, or with those of Aristotle and Des Cartes, he by no means coincides. This author says, "As ideas are the chief materials employed in reasoning and reflecting, it is of consequence that their nature and differences be understood. It appears now that ideas may be distinguished into three kinds: first, Ideas derived from original perceptions, properly termed ideas of memory; second, Ideas communicated by language or other signs; and third, Ideas of imagination. These ideas differ from each other in many respects; but chiefly in respect to their proceeding from different causes. The first kind is derived from real existences that have been objects of our senses; language is the cause of the second, or any other sign that has the same power with language; and a man's imagination is to himself the cause of the third. It is scarce [ly] necessary to add, that an idea, originally of imagination, being conveyed to others by language or any other vehicle, becomes in their mind an idea of the second kind; and again, that an idea of this kind, being afterwards recalled to the mind, becomes in that circumstance an idea of memory."--El. of Crit., Vol. ii, p. 384.
5. Whether, or how far, language is to the mind itself the instrument of thought, is a question of great importance in the philosophy of both. Our literature contains occasional assertions bearing upon this point, but I know of no full or able discussion of it.[30] Cardell's instructions proceed upon the supposition, that neither the reason of men, nor even that of superior intelligences, can ever operate independently of words. "Speech," says he, "is to the mind what action is to animal bodies. Its improvement is the improvement of our intellectual nature, and a duty to God who gave it."--Essay on Language, p. 3. Again: "An attentive investigation will show, that there is no way in which the individual mind can, within itself, to any extent, combine its ideas, but by the intervention of words. Every process of the reasoning powers, beyond the immediate perception of sensible objects, depends on the structure of speech; and, in a great degree, according to the excellence of this chief instrument of all mental operations, will be the means of personal improvement, of the social transmission of thought, and the elevation of national character. From this, it may be laid down as a broad principle, that no individual can make great advances in intellectual improvement, beyond the bounds of a ready-formed language, as the necessary means of his progress."--Ib., p. 9. These positions might easily be offset by contrary speculations of minds of equal rank; but I submit them to the reader, with the single suggestion, that the author is not remarkable for that sobriety of judgement which gives weight to opinions.
6. We have seen, among the citations in a former chapter, that Sanctius says, "Names are the signs, and as it were the instruments, of things." But what he meant by "instrumenta rerum" is not very apparent. Dr. Adam says, "The principles
