The elements of the psychology of cognition / by Robert Jardine.

  • Robert Jardine
Date:
1874
Catalogue details

Licence: Public Domain Mark

Credit: The elements of the psychology of cognition / by Robert Jardine. Source: Wellcome Collection.

    42/336 page 30
    CHAP. II. SECT. II. intermediate stages, into the one preceding it and the one following it. The science of optics shows ns that the spectrum is formed by the different rays which make up the white ray being inflected, some more and some less, in passing through the prism; this inflection increases with the shortness and rapidity of the waves; therefore, if we follow, from red to violet, the series of rays which form the spectrum, we find the shortening and acceleration of the waves go on increasing. Thus from red to violet, each sensation corresponds to waves quicker and shorter than those of the preceding sensation, slower and longer than those of the succeeding sensa- tion. An increase of speed and diminution of length in the waves are sufficient to determine the variations which our sensation of colour undergoes in passing from red to violet.” * We must remember that the object of conscious- ness connected with this sense is simply colour, and colour as distinguished from figure, direction, and distance. We are not conscious of any of the three latter, but simply of a sensation of colour. It may be alleged in objection to this that some kind of figure is inseparably connected with colour, and the significance of this fact we shall consider farther on. In the meantime it is sufficient to say that sensa- tions as states of consciousness are not extended, and that they are distinguished from one another only by difference in quality and time of occurrence* We have now finished our review of the various Taine, ‘On Intelligence,’ p. 117.
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