Diderot's Early Philosophical Works

Diderot's Early Philosophical Works

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...especially as their joy when things they have lost sight of appear again is mixed with surprise? Nurses help them to acquire the notion of the continuance of absent persons by playing a game which consists in hiding the face, and showing it again. Thus they learn a hundred times in a quarter of an hour that what ceases to appear does not necessarily cease to exist. Whence it follows that we owe the notion of the continuous existence olf objects to experience, of their distance to the sAnse of touch; that the eye may perhaps have to ldfcarn to see as the tongue to speak; that it would nfct be surprising should the aid of one of the sefcnses be necessary to another; and that touch, wjhich ascertains the existence of objects exterior to oilirselves when present to our eyes, is likewise the sepse to which the confirmation not only of their figjures, and other details of these objects, but even their presence, is reserved. To these arguments may be added the famous experiment of Cheselden.1 The young man from whose eyes this skilful surgeon removed cataracts was for a long time unable to distinguish dimensions, distances, positions, or even figures. An object an inch in size held before his eye so as to hide a house from him appeared as large as the house itself. All he saw seemed as close to his eye as the object he touched to the skin. He could not distinguish what he judged round by touch from what he had judged angular; nor distinguish by sight whether what he had felt to be above or beneath him were in reality above or beneath him. He eventually succeeded, but not without difficulty, in perceiving that his house was larger than his room, but he could not conceive how this could be ascertained by sight. Repeated experiments were necessary...show more

Product details

  • Paperback | 60 pages
  • 189 x 246 x 3mm | 127g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236794451
  • 9781236794451