In some papers which I have been allowed to print in the GeologicaiMagazine I have drawn the general conclusion that the Mammoth and his companions were finally overwhelmed by a great diluvial catastrophe. This conclusion I have based chiefly on other than stratigraphical evidence. If it be a reasonable conclusion, it ought to admit of being-supported by such evidence, and we are, in fact, bound to meet the purely geological side of the case. Believing that this may be done with the greatest confidence, and with the most complete advantage to the theory, I now propose to examine this evidence, with all deference, and I hope also with all frankness. There is virtually no dispute about the facts. These are familiar, and admitted, and the main contention is about the inferences to be drawn from them.