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It may be proper to observe, that by the unavoidable idiom of our language the ideas of perception, of recollection, or of imagination, in the plural number signify the ideas belonging to perception, to recollection, or to imagination; whilst the idea of perception, of recollection, or of imagination, in the singular number is used for what is termed "a reflex idea of any of those operations of the sensorium."
But the doctrine that all the phenomena of nature are resolvable into mechanism is what people have agreed to call "materialism;" and when Locke and Collins maintained that matter may possibly be able to think, and Newton himself could compare infinite space to the sensorium of the Deity, it was not wonderful that the English philosophers should be attacked as they were by Leibnitz in the famous letter to the Princess of Wales, which gave rise to his correspondence with Clarke.
And it has been already shewn, that these actions cannot be performed simply from irritation, because cold and darkness are negative quantities, and on that account sensation or volition are implied, and in consequence a sensorium or union of their nerves.
I wonder what the scent of jasmine did in Duncan Dempster's world. Perhaps it never got farther than the general ante-chamber of the sensorium. It often made his wife sad she could not tell why. To him I daresay it smelt agreeable, but I can hardly believe it ever woke in him that dreamy sensation it gave her of something she had not had enough of, she could not say what.
The immediate object however of the sense of vision is light; this fluid, though its velocity is so great, appears to have no perceptible mechanical impulse, as was mentioned in the third Section, but seems to stimulate the retina into animal motion by its transmission through this part of the sensorium: for though the eyes of cats or other animals appear luminous in obscure places; yet it is probable, that none of the light, which falls on the retina, is reflected from it, but adheres to or enters into combination with the choroide coat behind it.
The changes in the world of matter must be modified and, so to speak, refined by a peculiar class of secondary powers I mean the senses before they can produce in me any corresponding ideas; while, on the other hand, a fresh set of organic powers, the agents of voluntary movements must come into play between the inner spirit and the outward world in order to make the changes of the former tell upon the latter; thus must the operations of thinking and sensation alike correspond to certain movements of the internal sensorium.
It is probable that these reappearances of the image, after the light which produced the original impression has been withdrawn, are occasioned by spontaneous affections of the retina itself which are conveyed to the sensorium. In other cases, where the impressions are less strong, the physical changes producing these changes are perhaps confined to the sensorium."
'Others have considered infinite space as the receptacle, or rather the habitation of the Almighty; but the noblest and most exalted way of considering this infinite space, is that of Sir Isaac Newton, who calls it the sensorium of the Godhead.
She might lose her visibility, or her tangibility; or, in short, the power of making impressions upon the radical sensorium; so that he should never be able to tell whether she was dead or alive. Of course he made no further inquiries about her. One day he lost sight of his retinue in a great forest.
The phantom images of the retina are not perceptible in the light of the day. Those that exist in the sensorium in like manner do not attract our attention so long as the sensory organs are in vigorous operation, and occupied in bringing new impressions in.
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