The Tertiary period had also its prominent class of existences. Its flora seems to have been no more conspicuous than that of the present time; its reptiles occupy a very subordinate place; but its beasts of the field were by far the most wonderfully developed, both in size and numbers, that ever appeared upon earth. Its mammoths and its mastodons, its rhinoceri and its hippopotami, its enormous dinotherium and colossal megatherium, greatly more than equalled in bulk the largest mammals of the present time, and vastly exceeded them in number. The remains of one of its elephants (Elephas primigenius) are still so abundant amid the frozen wastes of Siberia, that what have been not inappropriately termed "ivory quarries" have been wrought among their bones for more than a hundred years. Even in our own country, of which, as I have already shown, this elephant was for long ages a native, so abundant are the skeletons and tusks, that there is scarcely a local museum in the kingdom that has not its specimens, dug out of the Pleistocene deposits of the neighborhood. And with this ancient elephant there were meetly associated in Britain, as on the northern continents generally all around the globe, many other mammals of corresponding magnitude. "Grand indeed," says an English naturalist, "was the fauna of the British islands in those early days. Tigers as large again as the biggest Asiatic species lurked in the ancient thickets; elephants of nearly twice the bulk of the largest individuals that now exist in Africa or Ceylon roamed in herds; at least two species of rhinoceros forced their way through the primeval forest; and the lakes and rivers were tenanted by hippopotami as bulky, and with as great tusks, as those of Africa." The massive cave-bear and large cave-hyæna belonged to the same formidable group, with at least two species of great oxen (Bos longifrons and Bos primigenius), with a horse of smaller size, and an elk (Megaceros Hibernicus) that stood ten feet four inches in height. Truly this Tertiary age—this third and last of the great geologic periods—was peculiarly the age of great "beasts of the earth after their kind, and of cattle after their kind."
Permit me at this stage, in addressing myself to a London audience, to refer to what has been well termed one of the great sights of London. An illustration drawn from what must be familiar to you all may impart to your conceptions, respecting the facts on which I build, a degree of tangibility which otherwise they could not possess.
LEPIDODENDRON STERNBERGII.
One of perhaps the most deeply interesting departments of your great British Museum—the wonder of the world—is that noble gallery, consisting of a suite of rooms, opening in line, the one beyond the other, which forms its rich storehouse of organic remains. You must of coarse remember the order in which the organisms of that gallery are ranged. The visitor is first ushered into a spacious room devoted to fossil plants, chiefly of the Coal Measures. And if these organisms are in any degree less imposing in their aspect than those of the apartments which follow in the series, it is only because that, from the exceeding greatness of the Coal Measure plants, they can be exhibited in but bits and fragments. Within less than an hour's walk of the Scottish capital there are single trees of this ancient period deeply embedded in the sandstone strata, which, though existing as mere mutilated portions of their former selves, would yet fail to find accommodation in that great apartment. One of those fossil trees,—a noble araucarian,—which occurs in what is known as the Granton quarry, is a mere fragment, for it wants both root and top, and yet what remains is sixty-one feet in length by six feet in diameter; and beside it there lies a smaller araucarian, also mutilated, for it wants top and branches, and it measures seventy feet in length by four feet in diameter. I saw lately, in a quarry of the Coal Measures about two miles from my dwelling-house, near Edinburgh, the stem of a plant (Lepidodendron Sternbergii), allied to the dwarfish club mosses of our moors, considerably thicker than the body of a man, and which, reckoning on the ordinary proportions of the plant, must have been at least seventy feet in height. And of a kind of aquatic reed (calamites), that more resembles the diminutive mare's tail of our marshes than aught else that now lives, remains have been found in abundance in the same coal field, more than a foot in diameter by thirty feet in length. Imposing, then, as are the vegetable remains of this portion of the National Museum, they would be greatly more imposing still did they more adequately represent the gigantic flora of the remote age to which they belong.
CALAMITES CANNÆFORMIS.
Passing onwards in the gallery from the great plants of the Palæozoic division to the animals of the Secondary one, the attention is at once arrested by the monstrous forms on the wall. Shapes that more than rival in strangeness the great dragons, and griffins, and "laithly worms," of mediæval legend, or, according to Milton, the "gorgons, hydras, and chimeras dire," of classical fable, frown on the passing visitor; and, though wrapped up in their dead and stony sleep of ages, seem not only the most strange, but also the most terrible things on which his eye ever rested. Enormous jaws, bristling with pointed teeth, gape horrid in the stone, under staring eye-sockets a full foot in diameter. Necks that half equal in length the entire body of the boa-constrictor stretch out from bodies mounted on fins like those of a fish, and furnished with tails somewhat resembling those of the mammals. Here we see a winged dragon, that, armed with sharp teeth and strong claws, had careered through the air on leathern wings like those of a bat; there an enormous crocodilian whale, that, mounted on many-jointed paddles, had traversed, in quest of prey, the green depths of the sea; yonder a herbivorous lizard, with a horn like that of the rhinoceros projecting from its snout, and that, when it browsed amid the dank meadows of the Wealden, must have stood about twelve feet high. All is enormous, monstrous, vast, amid the creeping and flying things and the great sea monsters of this division of the gallery.