Geology and Natural History. 231 
become habitable by man and the numerous mammals of the 
Quaternary fauna. 
ft 
preglacial or glacial date. the contrary, I am inclined to 
think that many of our principal valleys were already marked out 
in preglacial times, and that a large ortion of the whole 
ker 
hitherto discovered in Britain are concerned, we cannot safely 
carry back their existence to preglacial times, it by no means 
follows that the earliest traces of the occupation even of this part 
of the world by man have as yet been discovered. e Abbe 
by mammals as distinct from those of the present day as the 
cerotherium is from the Rhinoceros, or the Mastodon trom the 
Elephant, primeval man was fashioning implements indistin- 
guishable from those of neolithic times; while it is not until we 
come to the Sables de ’Orléannais, which are superimposed upon 
the Caleaire de Beauce, that we find the earliest trace of an 
anthropomorphous ape, in the shape of the Hylobates antiquus. 
The Dryopitheeus, it will be remembered, belongs to the Upper 
Miocene, 
While speaking of the possible errors of observation, I may 
mention that in Sweden the Sddertelje hut, which has often been 
So ancient a period as was formerly assigned to it, but is con- 
sidered as being of comparatively modern date. 
ut, returning to the main question, though for the present we 
Seem unable to find any satisfactory evidence of the existence of 
man in western Europe ; i 
follows that none such will eventually be found. It must, more- 
shane is fi o be sought i 
clime, and amidst a more luxurious vegetation, yielding through- 
out the year some readily available means of subsistence both to 
man and to animals that would serve him as food. In the earliest 
