General Remarks.
In Lyell's Antiquity of Man, p. 279, and in the works of several subsequent writers, are published maps showing the extent of sea which would become land by a general rise of 600 feet. Such elevations are supposed on good grounds to have occurred on two occasions. First, when the Cromer Forest bed flourished; and secondly, during the interglacial period which followed the formation of the boulder clay. It was during the latter that man and his contemporary mammalia roamed over Western Europe, and left their traces in the river-drift gravels and bone-caves of England.
Theories on the chronological phase of the subject are, however, so divergent and even contradictory, that the only thing one can do is to add to their number by advocating the opinion which commends itself to his judgment after carefully considering the leading facts of the problems at issue.
G. de Mortillet thus expresses his opinion of man's relation to the glacial epoch:—
M. Boule describes the contents of the Grotte du Prince (No, 7 of the Grottes de Grimaldi) as containing two distinct faunas one, the lowest, being represented by Elephas antiquus, Rhinoceros merckii, and especially the Hippopotamus; the second he distinguishes "par la disparition progressive des éléments chauds et par l'apparition ou développement d'espèces froides." He then observes that "the superposition of these