With these we quit the Secondary Island, and may next turn our attention to the island beyond, which contains the principal forms characterising the strata belonging to the tertiary period. Hitherto we have shown the visitor nothing but reptiles--now, upon the Tertiary Island, he will find a higher order of animal life, and meet with forms more nearly resembling our living animals. Next in procession are the animals restored by Baron Cuvier from fragments found in the Gypsum beds of the Paris basin: the _Palæotherium_, or Ancient Beast, might be justly called the first triumph of comparative anatomy, as from a few detached pieces of bone Cuvier was enabled to construct the entire animal, which, by his drawings, appears to have resembled the Tapir of the present day. After these come the more elegant pachydermatous animal called the _Anoplotherium commune_ and the _Anoplotherium gracilis_, and not far off we see the _Megatherium_, or Gigantic Sloth, in the act of pulling down a tree to obtain the leaves, upon which it was accustomed to feed, as its smaller analogies do at the present day. These, with the Irish Elks, first found in the Isle of Man, are grouped upon this island, and present a scene equally remarkable and instructive to all those who are interested in the natural history of the earlier periods of the earth. [Illustration: Great Pterodactyles.] No one can look upon all these singular and bulky productions, so unlike the comparatively familiar forms of even the rarer living animals, and yet with so much appearance of reality, without at once becoming sensible that a series of illustrations is before him, of a nature altogether different from any he has been accustomed to. The footmarks, the bones, the very skin in some cases, of animals long since extinct, have been preserved by being buried in mud which has afterwards been converted into solid rock. From these obscure guides, the comparative anatomist has ventured to describe the general form, the habits, and the peculiarities of the race. From such descriptions, penned chiefly by Cuvier, Mantell, and Owen, has Mr. Waterhouse Hawkins restored and by degrees built up the animals. Possessing a great knowledge of the peculiarities of many living species; and being strong in his own feeling of what was probable and natural in the numerous details that required consideration, he has skilfully and cautiously constructed these restorations, and his embodiments of the opinions of the greatest palæontologists are indeed equally bold and conscientious. Professor Owen, the most eminent living authority upon these subjects, has kindly rendered Mr. Hawkins every assistance in his undertaking.