76 



TREE ANCESTORS 



siderable number of occurrences have been recorded from the 

 Pliocene of that region and the Auvergne was evidently clothed 

 with a considerable stand of walnut before the advent of the human 

 race. During the Pleistocene this species left its remains at a 

 number of locaUties in northern Italy, in Hanover, in southern 

 France (Provence), and nuts found in the Swiss lake dwellings 

 were undoubtedly from wild trees and furnished part of the dietary 



Fig. 14. Map Showing the Areas of Distribution of Engelhardtia, 



Oreomunnea, Platycarya and Pterocarya (solid black) and the 



Area Over Which They Are Known to Have Spread 



During Their Past History 



Pterocarya is indicated by vertical lining and Engelhardtia (including 

 Oreomunnea) by horizontal lining. 



of the first race of which we have record who had domesticated 

 animals and practiced even a rude agriculture. 



The manner in which the fossils enable us to obtain a vista into 

 the life of bygone days is furnished by recent discoveries in the 

 Egyptian desert. At a time (latest Eocene or earliest Oligocene) 



