(1) The Physiology of Vision, with Special Reference to Colour Blindness (2) Card Test for Colour Blindness

Abstract

THE great importance of the subject-matter of the volume under notice and of the card-test which supplements it is beyond all question. Interest in it is enhanced by the fact that the subject is admittedly full of difficulties. In every discussion of human sensations and of the organs which serve as the receivers of stimuli, one is impressed by the uncertainty of much which has been put forward as assured truth. It is not long ago that the mechanism of audition was being discussed anew, and even now, in spite of the renewed examination, the functions of various parts of the ear are much in debate. Yet in audition we have to deal with purely mechanical stimuli which we might have expected to have yielded up the secrets of their operation long ago. In the case of light the problem is clearly of a more recondite order, and it is not so surprising that little is actually known with certainty about the functions of various parts of the eye, and that we have therefore to fall back upon surmise.

(1) The Physiology of Vision, with Special Reference to Colour Blindness.

By Dr. F. W. Edridge-Green. Pp. xii + 280. (London: G. Bell and Sons, Ltd., 1920.) Price 12s. net.

(2) Card Test for Colour Blindness.

By Dr. F. W. Edridge-Green. 24 cards. (London: G. Bell and Sons, Ltd., n.d.) Price 25s. net.