FOOTNOTES:

[1] This was suggested to me by Mr. G. A. Garfitt.

[2]

Estimated duration of the Cainozoic Period, assuming that the thickness of the deposits is about 63,000 feet, and that deposits accumulate at the rate of 1 foot in 100 years. Drawn to the scale of 1 mm. to 100,000 years. The estimate is given and explained by Prof. Sollas in the Quarterly Journal of the Geological Society, LXV. (1909). The “tree” is based on that given by Dr. A. Keith in The Antiquity of Man, p. 509.