Introduction 



ui 



In sparsely inhabited countries millions of people live in this manner at the present day. With 

 increasing population these methods become impossible, and in China we find -the soil 

 cultivated to its fullest extent, and all possible means adopted to increase the output from 

 a given area. 



In most countries it was soon found that all districts were not equally adapted to the cultivation 

 of every crop, and a simple system of exchange arose by which one group bartered perhaps 

 their surplus cotton for rice or some other commodity to the cultivation of which their own 

 locality was not suited. In closely adjacent areas this exchange would be carried out directly 

 by the producers. As man became more enterprising and the means of communication 

 developed, people travelled further afield, and now in Africa men journey hundreds of miles 

 with a portion of their crop to exchange it for some valued product brought to the rendezvous 

 from perhaps an equal distance by another group of producers. The business of the exchange 

 of goods had reached a high degree of development before the Christian Era. The Carthaginians 



By permissio 



BIG TREES 



