Elementary Logic

Elementary Logic

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...irrelevant. But suppose an aeroplane suddenly behaves in an unexpected manner, we can well imagine even experts differing on the question which of the circumstances that preceded the change were relevant and which were not. Again, Mill notes that even when the best use is made of such " knowledge " (or guess work) " it is seldom that Nature affords two instances of which we can be assured that they stand in this precise relation to one another. In the spontaneous operations of Nature there is generally such complication and such obscurity, they are mostly either on so overwhelmingly large or on so inaccessibly minute a scale, we are so ignorant of a great part of the facts which really take place, and even those of which we are not ignorant are so multitudinous, and therefore so seldom exactly alike in any two cases, that a spontaneous experiment, of the kind required by the Method of Difference, is commonly not to be found." On this account the chief use of the Method of Difference, according to Mill, is in careful experiments where we can know pretty well what we are doing. " A certain state of surrounding circumstances existed before we commenced the experiment; this is BC. We then introduce A; say, for instance, by merely bringing an object from another part of the room, before there has been time for any change in the other elements....We choose a previous state of things with which we are well acquainted, so that no unforeseen alteration in that state is likely to pass unobserved; and into this we introduce, as rapidly as possible, the phenomenon which we wish to study; so that in general we are entitled to feel complete assurance that the pre-existing state, and the state which we have produced, differ in nothing except the presence or...show more

Product details

  • Paperback | 72 pages
  • 189 x 246 x 4mm | 145g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236663969
  • 9781236663962