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actually afford already appear asserted believe body Brain called cause Cerebral Vision certain certainly circle co-incident Color Images concerning consequence consideration considered corresponding course crossed David Brewster demonstrated described dioptrical direction distance employed equally evidence existence experiments express extent external object fact fall farther Feather field Figure ground half head important impressions inverted judge judgment known labors laws least less light look manner matter means mind Mode nature never Newton nose observe occasion opposite Optical perceive person phenomena philosophical position present pressure principle produced proof proper Proposition proved question Rationale rays reader reason recrossed regard Reid remark result retina Science seen Sensations Sensations of Colors sense Sensorium Sentient side sight single situated supposed thing tion Touch true truth visible Vision visual visual image whole Writers
Page 44 - Is not the Sensory of Animals that place to which the sensitive Substance is present, and into which the sensible Species of Things are carried through the Nerves and Brain, that there they may be perceived by their immediate presence to that Substance?
Page 5 - ... does it not appear from Phaenomena that there is a Being incorporeal, living, intelligent, omnipresent, who in infinite Space, as it were in his Sensory, sees the things themselves intimately, and thoroughly perceives them, and comprehends them wholly by their immediate presence to himself; Of which things the Images only carried through the Organs of Sense into our little Sensoriums, are there seen and beheld by that which in us perceives and thinks.
Page 158 - ... these Colours arise from such Motions excited in the bottom of the Eye by the Pressure and Motion of the Finger, as, at other times are excited there by Light for causing Vision? And do not the Motions once excited continue about a Second of Time before they cease? And when a Man by a stroke upon his Eye sees a flash of Light, are not the like Motions excited in the Retina by the stroke?
Page 5 - When a Man in the dark presses either corner of his Eye with his Finger, and turns his Eye away from his Finger, he will see a Circle of Colours like those in the Feather of a Peacock's Tail.
Page 9 - Apparitions are likewise considered by him as nothing more than ideas, or the recollected images of the mind, which have been rendered more vivid than actual impressions.
Page 5 - And these things being rightly dispatch'd, does it not appear from Phaenomena that there is a Being incorporeal, living, intelligent, omnipresent, who in infinite Space, as it were in his Sensory, sees the things themselves intimately, and thoroughly perceives them, and comprehends them wholly by their immediate presence to himself...
Page 9 - I propose to go much farther, and to show that the ' mind's eye' is actually the body's eye, and that the retina is the common tablet on which both classes of impressions are painted, and by means of which they receive their visual existence according to the same optical laws. Nor is this true merely in the case of spectral illusions ; it holds good of all ideas recalled by the memory, or created by the imagination, and may be regarded as a fundamental law in the science of pneumatology.
Page 49 - It is now about fifteen months since a similar affection occurred again to myself, without my being able to assign any cause whatever, or to connect it with any previous or subsequent indisposition. The blindness was first observed, as before, in looking at the face of a person I met, whose left eye was to my sight obliterated. My blindness was in this instance the reverse of the former, being to my right (instead of the left) of the spot to which my eyes were directed ; so that I have no reason...
Page 10 - For the rays to speak properly are not coloured. In them there is nothing else than a certain power and disposition to stir up a sensation of this or that colour.