An Appeal to Philosophers By Name On the Demonstration of Vision in the Brain
An Appeal to Philosophers By Name On the Demonstration of Vision in the Brain
John Fearn
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Now, this most beautiful and astonishing exhi- bition ; and the tracing of its Rationale ; is that which has, by Sir David Brewster, been desig- nated the " PHILOSOPHY OF FOOLS. " And this designation he has, as he thinks, justified by his turning the FACT of Two eyed Vision, into a supposed Case of the Vision of a single object, view- ed by a single eye. The Example of the Recrossed Feathers, now afforded, however, may be considered as a FIRST FRUIT, or leading crucial example, of Recross Cere...bral Vision. But there is a consideration here, which we must not leave behind us ; and, which is that of an attempt on the part of Sir David Brewster to invalidate Recross Vision by means of introducing 24 THE USHERING IN OF an Extraneous Phenomenon into the example which I have just afforded. Thus, he says, in speaking of my labor : " If he had acted upon his eye-ball " with a greater pressure, an experiment not very " safe ; he would have found that the pressure was " propagated across the eye-ball, to the opposite " point of the retina; and, that in consequence " of two opposite points of the retina being acted " upon simultaneously by pressure on one point, " two diametrically opposite luminous images are " produced.
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