[11] Romanes, Animal Intelligence, p. 27.
[12] Mantagazza, loc. cit., p. 97.
[13] Darwin, Descent of Man, pp. 262, 263.
[14] William Hamilton Gibson, Sharp Eyes, p. 307.
[15] I have a distinct purpose in introducing these and other queer-eyed individuals while discussing the sense of sight. I wish to demonstrate through one or more of them the correlation of morphology, physiology, and psychology, as formulated in the first chapter of this work. This is one of the most important facts in the doctrine of evolution, and upon it is based the law of progressive psychical development from the simple manifestations of conscious determination in the lowest organisms to the most complex operations of the mind in man.
[16] Semper, Animal Life, p. 374 et seq.
[17] Consult Furneaux, Life in Ponds and Streams, p. 325.
[18] Consult Comstock, Manual for the Study of Insects, p. 110.
[19] Consult Comstock, loc. cit. ante, p. 455.
[20] Bolles Lee, Les Balanciers des Dipteres; quoted also by Lubbock, Senses, Instincts, etc., pp. 110, 111.