[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.