Popular Lectures On Scientific Subjects

Cover Popular Lectures On Scientific Subjects
Popular Lectures On Scientific Subjects
Hermann Von Helmholtz
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— Tb.
THE SENSATION OF SIGHT. 249 from the middle of the field ; and, on the other hand, wlien they appear white here, are red to direct vision. These inequalities of the retina, like the others men- tioned in the former essay, are rectified by the con- stant movements of the eye. We know from the pale and indistinct colours of the external world as usually seen, what impressions of indirect vision correspond to those of direct ; and we thus learn to judge of the colours of objects according to
... the impression which they luoiild make on us if seen directly. The result is, that only unusual combinations and unusual or special direction of attention enable us to recognise the difference of which I have been speaking.
The theory of colours, with all these marvellous and complicated relations, was a riddle which Goethe in vain attempted to solve ; nor were we physicists and physio- logists more successful. I include myself in the number ; for I long toiled at the task, without getting any nearer my object, until I at last discovered that a wonderfully simple solution had been discovered at the beginning of this century, and had been in print ever since for any one to read who chose.


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