The Natural History of the Varieties of Man

by R. G. Latham

XXXII.

To be thus co-extensive, it must be found at equally high and low sea-levels, as well as at equally distant degrees of latitude and longitude.

XXXIII.

Antiquity of the human species.—This problem is most likely to be worked through the phænomena of language. When determined it will give precision to the recent period of the geologist, converting it from a relative into a conventionally absolute epoch.

XXXIV.

The average rate at which languages change is capable of being approximated.

XXXV.

The maximum difference, at a given period, between two or more languages is also capable of being approximated.

XXXVI.

The original unity of the species is a postulate.