[9] See Huxley—Invertebrate Animals, Anatomy of.
[10] Phys. Basis of Life.
[11] Beginnings of Life, p. 104, Vol. I.
[12] Monthly Micros. Jour., May 1, '69, p. 294.
[13] Chem. and Phys. Balance of Organic Nature, 1848, p. 48 (trans.).
[14] Inaugural Address, Aug. 19, 1874.
[15] Haeckel—Hist. of Creation.
[16] See Haeckel—Evol. of Man.
[17] Evolution of Man, Vol. II, p. 445.
[18] Johnson's Cyclopedia, Article "Evolution."