Granville Penn, in dealing with the difficulties of the Kirkdale Cave, so remarkable for its accumulations of gnawed bones of the Pleistocene ages,--especially for its bones of hyænas, tigers, bears, wolves, rhinoceroses, and elephants. The cave occurs in the moorlands of Yorkshire, in a limestone rock of that Oolitic division to which the Oxford Clay and the Coral Rag belong, and contains corals and shells that had passed into extinction long even ere the Tertiary period began; while in the cave itself, mixed with bones of the extinct mammals of the geologic age in immediate advance of the present one, there have been found the contemporary remains of animals that still live in our fields and woods, such as the hare, the rabbit, the weasel, and the water rat. And we find Mr. Penn assigning both the Oolitic rock in which the cave is hollowed, and the mammalian remains of the cave itself, equally to the period of the deluge. The limestone existed at that time, it would seem, as a soft calcareous paste, into which the animal remains, floated northwards from intertropical regions on the waters of the Flood, were precipitated in vast quantities, and sank, and then, fermenting under the putrefactive influences, the gas which they formed blow up the yielding lime and mud around them into a long narrow cave, just as a glass-blower blows up a bottle, or as a little yeast blows up into similar but greatly smaller cavities a bit of leaven. And the stalactites and stalagmites which encrust the Kirkdale Cave are, Mr. Penn holds, simply the last runnings of the lime that exuded after the general mass had begun to set. Certainly any one disposed to take such liberties with the Bible on the one hand, and with geologic science on the other, as those taken in the given instances by this most formidable of the anti-geologists, could have but little difficulty in making either Scripture as geological or geology as Scriptural as he had a mind. His chief danger would be that of making the sounder theologians just a little angry, and of escaping, unless quoted for the joke's sake, the notice of the geologists altogether. In truth, the extreme absurdity of our later anti-geologists in virtually contending, in the controversy, that _their_ ignorance of an interesting science, founded on millions of determined facts, ought to be permitted to weigh against the knowledge of the men who have studied it most thoroughly, forms their best defence. It secures them against all save neglect. As, however, some of their number are well meaning men, who would not be ridiculous if they could help it, and only oppose themselves to the geologists because they deem them mischievous and in error, it may be worth while showing them, by an example or two, the ludicrous nature of the positions which in their honest ignorance they permit themselves to occupy, and the real scope and bearing of the arguments which they unwittingly permit themselves to use. I shall adduce two several