[10] Phanerogams.
[11] Deciduous trees.
[12] This, says Mr. R. I. Pocock, has to be qualified. There were Carboniferous spiders with spinnerets, though they may have used the silk only for egg cases. And he thinks that the Carboniferous myriapods point to ground beneath the trees.
[13] See Sir R. Ball’s Causes of the Great Ice Age, and Dr. Croll’s Climate and Time. These are sound books to read still, but the reader will find many of their conclusions modified in Wright’s The Quaternary Ice Age, which is a quarter of a century more recent.
[14] Dr. Marie Stopes, Monograph on the Constitution of Coal.
[15] See article “Cephalopoda” in the Encyclopædia Britannica for its anatomy.
[16] And here the genius of a great humorous artist (E. T. Reed) obliges us to add a footnote to clear away a common misconception. He was the creator of a series of fantastic pictures, Prehistoric Peeps, which have had a deserved and immense vogue, and it was his whim to represent primitive men as engaged in an unending wild struggle with great Plesiosaurs and the like. His fantasy has become a common belief. As we shall see, millions of years elapsed between the vanishing of the last great Mesozoic reptile and the first appearance of man upon this earth. Early man had as contemporaries some monstrous animals, as we shall note, but not these extreme monsters.
In these opening six chapters we have been much indebted, in addition to the books already named in the text or in footnotes, to Ray Lankester’s Extinct Animals, Osborne’s Age of Mammals, Jukes Browne’s, Lyell’s and Pirsson and Schuchert’s textbooks of geology, and the collections and catalogues of the Natural History Museum at South Kensington. H. R. Knipe’s From Nebula to Man and his Evolution in the Past have also been very useful and suggestive. These two books are full of admirable illustrations of extinct monsters by Miss G. M. Woodward and Mr. Bucknall. There are good figures also in Extinct Monsters and Creatures of Other Days by H. N. Hutchinson.
[17] They secrete a nutritive fluid on which the young feeds from glands scattered over the skin. But the glands are not gathered together into mammæ with nipples for suckling. The stuff oozes out, the mother lies on her back, and the young browse upon her moist skin.
[18] Die Alpen in Eiszeitalters, vol. iii.