[48] Dana, "Manual," p. 59.

[49] "Manual," p. 793.

[50] "Manual," p. 488.

[51] "Distribution of Life," p. 33.

[52] "Manual," p. 611.

[53] "Manual," pp. 628-9.

[54] Note—This is only carrying the argument a little further than Huxley does when he says that "A Devonian fauna and flora in the British Islands may have been contemporaneous with Silurian life in North America, and with a Carboniferous fauna and flora in Africa. Geographical provinces and zones may have been as distinctly marked in the Palaeozoic epoch as at present." "Discourses," p. 286.

[55] "Manual," p. 229.

[56] Pop. Sci. Mo., Vol. xxi, pp. 143, 693.

[57] "Manual," p. 141.