| 392, The American Naturalist. 
the valleys of the northwest of Europe during the time these 
were occupied by paleolithic man. We can only affirm thai 
ma is the result of alluvial action very much prolonged. 
argued at length: ‘‘ The Great Ice Age,” and “ Prehistoric Ei 
and said he was content with conclusions he had therein anno 
favor of that periodicity. Eo 
M. Adrien de Mortillet was of the opinion that the theory 
from Belgrand. This theory was not affected by the fact that- 
had been found at the bottom of the gravel the bones of the Rhin 
the lower strata, by which the latter were changed in their charac 
appearance. 
Dr. Gosse presented certain Chelléen implements, the first 
Mr. John Evans visited, now thirty years ago, Saint Acheul 
pany with Prestwich, and he adopted with all his heart that 
been said by that great geologist. The paleontologic i evid 
uncertain and sometimes founded in error. At Norfolk, fi 
there is in one stratum Z/ephas antiquus, in the same the 
and it is impossible to establish in the stratum a proper di 
M. Gabreil de Mortillet defended the geologists against the 
of neglect in investigations into the prehistoric. The ¢ 
valleys is a question difficult to solve. The wisest man Y 
extensive knowledge seems unable to harmonize all the fi 
