[29] Indications of the Creator.
[30] Evolution and Progress, p. 26, Rev. Wm. I. Gill.
[31] Natürl. Schöpfungsgesch., pp. 643-5.
[32] Paget, Lectures on Surgical Pathology, 1853, Vol. I, p. 71.
[33] Ueber die Richtung der Haare am menschlichen Körper.
[34] Pop. Sci. Monthly, June, 1879, p. 250.
[35] See Sci. Am., May 18, 1878.
[36] Source of Muscular Power, Proc. Roy. Inst., June 8, 1866. Am. I. Sci., II, xlii, 393, Nov. 1866.
[37] Comparative Zoology, p. 45.
[38] Correlation of the Vital and Physical Forces, p. 54.