The Elements of Inductive Logic: Designed Mainly for the Use of Students in the Universities

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At the Clarendon Press, 1872 - Induction (Logic) - 344 pages
 

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Page 76 - ... within. The instances, on the contrary, in which no dew, or but a small quantity of it, is formed, and which are also extremely various, agree (as far as we can observe) in nothing except in not having this same property. We seem, therefore, to have detected the characteristic difference between the substances on which dew is produced, and those on which it is not produced. And thus have been realized the requisitions of what we have termed the Indirect Method of Difference, or the Joint Method...
Page 16 - THE Mind, being every day informed, by the Senses, of the alteration of those simple Ideas, it observes in things without; and taking notice how one comes to an end, and ceases to be, and another begins to exist, which was not before; reflecting also on what passes within it self, and observing a constant change of its Ideas, sometimes by the impression of outward Objects on the Senses...
Page 93 - Whatever phenomenon varies in any manner, whenever another phenomenon varies in some particular manner, is either a cause or an effect of that phenomenon, or is connected with it through some fact of causation.
Page 98 - The business of Inductive Logic is to provide rules and models (such as the Syllogism and its rules are for ratiocination) to which if inductive arguments conform, those arguments are conclusive, and not otherwise.
Page 17 - BUT to hasten to a conclusion of this argument, which is already drawn out to too great a length: we have sought in vain for an idea of power or necessary connexion in all the sources from which we could suppose it to be derived.
Page 90 - Many of the new elements of chemistry have been detected in the investigation of residual phenomena. Thus Arfwedson discovered lithia by perceiving an excess of weight in the sulphate produced from a small portion of what he considered as magnesia present in a mineral he had analyzed.
Page 141 - Fallacy is for the most part conveyed, it must of course be often a matter of .doubt, or rather, of arbitrary choice, not only to which genus each kind of Fallacy should be referred, but even to which kind to refer any one individual Fallacy...
Page 129 - ... importance to those who desire to originate just and comprehensive views concerning the structure of our globe. Now Werner had not travelled to distant countries ; he had merely explored a small portion of Germany, and conceived and persuaded others to believe that the whole surface of our planet, and all the mountain chains in the world, were made after the model of his own province.
Page 162 - De antiquitate autem, opinio quam homines de ipsa fovent negligens omnino est, et vix verbo ipsi congrua. Mundi enim senium et grandaevitas pro antiquitate vere habenda sunt; quae temporibus nostris tribui debent, non juniori aetati mundi, qualis apud antiquos fuit.
Page 67 - If an instance in which the phenomenon under investigation occurs, and an instance in which it does not occur, have every circumstance in common save one, that one occurring in the former; the circumstance in which alone the two instances differ, is the effect, or the cause, or an indispensable part of the cause, of the phenomenon.

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