A Manual of the Antiquity of Man

by J. P. MacLean

[16] "Antiquity of Man," p. 97; "Pre-Historic Times," p. 315.

[17] The "Science Record" for 1874, p. 501, in speaking of these implements says, "At the very lowest estimate, the flint weapons were made half a million years ago."

[18] "Antiquity of Man," p. 98. "Pre-Historic Times," p. 317.

[19] "Antiquity of Man," p. 338; Buchner, 27.

[20] "Antiquity of Man," p. 510; Buchner, p. 27.

[21] Buchner, pp. 118, 306.

[22] Buchner, p. 239.

[23] "Principles," vol. ii, p. 566.

[24] "Antiquity of Man," p. 63.

[25] It has been estimated by the British Association that it requires twenty thousand years to produce a foot of stalagmite.—Science Record. 1874, p. 601.