Note 2 — Front matter

The terms 'Palæolithic' and 'Neolithic' have been used for the men of the Palanthropic and Neanthropic ages; but these are objectionable, as implying that these ages can be best distinguished by the use of certain stone implements, which is not the fact. I have preferred, therefore, to call the earlier races of men palæocosmic, and the later neocosmic, where it may be necessary to refer to them as races; while the periods to which they belong are respectively the Palanthropic and Neanthropic. By the use of these terms all ambiguity will be avoided.