Elements of Deductive Logic

Cover Elements of Deductive Logic

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: correct and ej/egant speaking and writing, so logic is helpful to correct and cogent thinking. § 3. The object-matter of logic is thought. Each science has its own .object-matter. As astronomy treats of the stars, geology of the earth's crust, zoology of its fauna, botany of its flora, mathematics of quantity, theol

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ogy of God, philosophy of principles, psychology of mind, ethics of morals, so logic treats of thought. Thought denotes the acts of the understanding as distinguished from perception, memory, imagination, feeling, desire, and volition, of whose exercises logic takes no notice. Thought is the bringing a notion into or under another. This is to comprehend or understand it. For example, when I say a lily is a flower, I bring my notion lily under a class-notion flower, and so this is a thought. Now, we think about all kinds of things, but logic is indifferent to all except one? that is, thought itself. In studying logic, we think about thought. As a science, it is the theory of thought. Let it not be supposed, however, that logic treats of thought as exercised in scientific pursuits only. It treats of thought universally. Thought as found in all sorts of literature and speech, in common conversation, in silent meditation, all our every-day thinking about the most trivial things at any instant, as well as the lofty thought of the philosopher or theologian, is of the same nature, proceeds in the same manner, is according to the same laws, is chapter{Section 4logical if correct. Logic explains how any human mind thinks correctly at any time about any thing. § 4. It appears, then, that logic has nothing to do with the things we think about. It treats of thought in disregard of its content. Excluding the matter of thought, it discusses the form of thought. The form a...

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