Note 23 — I. THE EXTINCT.

Because comparatively few readers, and especially the critics, will take the trouble to ascertain what an author really means if he attempt argumentation, generally supposing him to be proving something else than he propounds to himself, it may be needful to say, that I am not touching the question of the time required for the formation of the stratified rocks in general, but solely for that of the later Tertiary deposits.