There remains a factor of considerable importance which has not yet received the attention it deserves, the physiological changes resulting from environment.
This aspect of the question has come under the notice of the author by measuring the vision of experts who excelled in given hues. It was generally found that their vision was sensitive to a small increment of their particular colour in harmonies where it was silent to a normal vision.
In seeking an explanation of this phenomenon there are at least three possible lines for working:
First. Is the vision naturally more sensitive to that particular energy?
Second. Is it by careful education?
Third. Is it an unconscious adaptation to surroundings, such as other organs undergo under changes of environment?
PLATE XI
SPECIFIC COLOUR CURVES OF HEALTHY AND DISEASED HUMAN BLOOD
