154 
DR. HICKS-PRE-HISTORIC MAH IN BRITAIN. 
As none of the characteristic extinct Mammalia occur in deposits 
subsequent to that period, it is natural to suppose that they did 
not return to this country after it was re-elevated, and the break 
between Palaeolithic and Neolithic man is found to correspond with 
the time indicated by these great changes. Palaeolithic man, like the 
lower animals, was driven out of this country by these great physical 
influences, and though he afterwards occupied for a time some parts 
of the south-east of Europe, when the climate gradually changed 
and the glaciers retreated, it seems clear that he must have re¬ 
turned northwards with the reindeer and other northern animals. 
As the work of forming and spreading over the world the races of 
mankind was done in the Pre-historic period, we are justified in 
assigning to that period a long stretch of time, and also in believing 
that though the Palaeolithic hunters were then a northern race, 
their ancestors may at some very remote period have migrated from 
an original home in a more genial clime. 
The next race that invaded this country belonged to the Newer 
Stone age, and its members were much more advanced, being to a 
certain extent cultivators of the soil, and accompanied by domestic 
animals. They doubtless arrived from an eastern or southern source, 
and in time spread over the whole of our islands. They are supposed 
to have belonged to the Iberic race and to have been of small stature 
with long or oval skulls of fair average capacity. Their imple¬ 
ments are found frequently in barrows, etc. 
In course of time another invasion took place, from an eastern 
or north-eastern direction, by the Celtic race, and it was an admix¬ 
ture of these two races that the Romans found here when they 
first reached this country. 
