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Essays on the Active Powers of the Human Mind; An Inquiry Into the Human Mind on the Principles of Common Sense and an Essay on Quantity

Essays on the Active Powers of the Human Mind; An Inquiry Into the Human Mind on the Principles of Common Sense and an Essay on Quantity


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About the Book

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.1843 Excerpt: ... appears from the phenomena of single and double vision, recited in sect. 13, that our seeing an object single with two eyes, depends upon these two things. First, upon that mutual correspondence of certain points of the retina; which we have often described. Secondly, upon the two eyes being directed to the object so accurately, that the two images of it fall upon corresponding points. These two things must concur in order to our seeing an object single with two eyes; and as far as they depend upon custom, so far only can single vision depend upon custom. With regard to the second, that is, the accurate direction of both eyes to the object, I think it must be acknowledged that this is only learned by custom. Nature hath wisely ordained the eyes to move in such manner, that their axes shall always be nearly parallel; but hath left it in our power to vary their inclination a little, according to the distance of the object we look at. Without this power, objects would appear single at one particular distance only; and at distances much less, or mucl greater, would always appear double. The wisdom of nature is conspicuous in giving us this power, and no less conspicuous in making the extent of it exactly adequate to the end. The parallelism of the eyes in general, is therefore the work of nature; but that precise and accurate direction, which must be varied according to the distance of the object, is the effect of custom. The power which nature hath left us of varying the inclination of the optic axes a little, is turned into a habit of giving them always that inclination which is adapted to the distance of the object. But it may be asked, What gives rise to this habit? The only answer that can be given to this question is, that it is found necessary to perfect...


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Product Details
  • ISBN-13: 9781150213595
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 258
  • Spine Width: 14 mm
  • Width: 189 mm
  • ISBN-10: 1150213590
  • Publisher Date: 06 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 467 gr


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