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abstract affirmed Analogy Analytic proposition animal antecedent applicable argument Aristotle Arts assert attribute belongs Boethius categorical proposition Categorical Syllogism Categories causal cause characteristics chiliagons classification concept conceptual order conclusion connexion connotation considered constitute Contrapositive copula deduction defined definition denied denoted determined differentia disjunctive disjunctive proposition distinction distinguish division doctrine effect employed Enthymeme existence experience explain expressed fact fallacy false figure genus give Hence hypothesis hypothetical hypothetical syllogism immediate inference individual Induction instance intellect judgment knowledge laws of thought Logic logicians major premiss meaning mental merely Metaphysics method middle term Mill mind mortal nature negative object observed Obversion particular philosophy polysyllogism possess possible predicate principle question quod real order reason regard relation represented rules Scholastic Scholasticism scientific sense signify Socrates species substance syllogism theory things Thomas thought tion triangle true truth universal proposition whole word
Page 273 - The only proof capable of being given that an object is visible, is that people actually see it. The only proof that a sound is audible, is that people hear it: and so of the other sources of our experience. In like manner, I apprehend, the sole evidence it is possible to produce that anything is desirable, is that people do actually desire it.
Page 418 - Matters of fact, which are the second objects of human reason, are not ascertained in the same manner; nor is our evidence of their truth, however great, of a like nature with the foregoing. The contrary of every matter of fact is still possible; because it can never imply a contradiction, and is conceived by the mind with the same facility and distinctness, as if ever so conformable to reality.
Page 404 - God himself who has created it, and without enducing them from any other source than from certain germs of truths naturally existing in our minds. In the second place, I examined what were the first and most ordinary effects that could be deduced from these causes; and it...
Page 241 - The Law of Causation, the recognition of which is the main pillar of inductive science, is but the familiar truth that invariability of succession is found by observation to obtain between every fact in nature and some other fact which has preceded It...
Page 321 - If two or more instances of the phenomenon under investigation have only one circumstance in common, the circumstance in which alone all the instances agree is the cause (or effect) of the given phenomenon.
Page 153 - The former of these propositions is not a definition at all: the latter is a mere nominal definition, or explanation of the use and application of a term. The first is susceptible of truth or falsehood, and may therefore be made the foundation of a train of reasoning.
Page 241 - If this be actually done, the principle which we are now considering, that of the uniformity of the course of nature, will appear as the ultimate major premise of all inductions...
Page 347 - ... the squares of the periodic times are as the cubes of the distances from the common centre, the centripetal forces will be inversely as the squares of the distances.
Page 322 - If two or more instances in which the phenomenon occurs have only one circumstance in common, while two or more instances in which it does not occur have nothing in common save the absence of that circumstance, the circumstance in which alone the two sets of instances differ is the effect, or the cause, or an indispensable part of the cause, of the phenomenon.