These animals, “weird and terrible,” were, to give a few instances: (1) The genus Cidastes, whose huge bones and vertebræ show them to have attained a length of nearly two hundred feet. The remains of such monsters, no less than ten in number, were seen by Professor Marsh in the Mauvaises Terres of Colorado, strewn upon the plains. (2) The Titanosaurus Montanus, reaching fifty or sixty feet in length. (3) The Dinosaurians, in the Jurassic beds of the Rocky Mountains, of still more gigantic proportions. (4) The Atlantosaurus Immanis, a femur of which alone is over six feet in length, and which would be thus over one hundred feet in length. But even yet the line has not been reached, and we hear of the discovery of remains of such titanic proportions as to possess a thigh‐ bone over twelve feet in length!(503) Then we read of the monstrous Sivatherium in the Himâlayas, the four‐horned stag, as large as an elephant, and exceeding the latter in height; of the gigantic Megatherium; of colossal flying lizards, Pterodactyli, with crocodile jaws on a duck’s head, etc. _All these were coëxistent with man, most probably attacked man, as man attacked them._ And we are asked to believe that the said man was no larger then than he is now! Is it possible to conceive that, surrounded in Nature with such monstrous creatures, man, unless himself a colossal giant, could have survived, while all his foes have perished? Is it with his stone hatchet that he had the best of a Sivatherium or a gigantic flying saurian? Let us always bear in mind that at least one great man of Science, de Quatrefages, sees no good scientific reasons why man should not have been “contemporaneous with the earliest mammalia and go back _as far as the Secondary Period_.”(504) The very conservative Professor Jukes writes: It appears that the flying dragons of romance had something like a real existence in former ages of the world.(505) And the author goes on to ask. Does the written history of man, comprising a few thousand years, embrace the whole course of his intelligent existence? Or have we in the long mythical eras, extending over hundreds of thousands of years, and recorded in the chronologies of Chaldæa and China, shadowy mementoes of prehistoric man, handed down by tradition, and perhaps transported by a few survivors to existing lands, from others which, like the fabled Atlantis of Plato, may have been submerged, or the scene of some great catastrophe which destroyed them with all their civilization?(506)