INFLUENCES OF ENVIRONMENT 



153 



Isolation affects not only the physical characters of 

 the people but their cultural development as well. Sep- 

 arated from the stream of collective experience by moun- 



1 



- ' 



FIGURE 54. Natives adapting their life to dangerous conditions of existence. 

 A tree-dwelling in the tiger infested jungles of India. 



tain barrier or sea, men retain customs and usages which 

 have long since fallen into disuse in the thronging centers 

 of life on the neighboring plain or continent. Sardinia 

 and Corsica are two of the most primitive spots in all 

 Europe because they are islands off the main line. To 

 a large extent feudal institutions of the Middle Ages pre- 

 vail. The old wooden plow of the Romans is still in 



