﻿Umnapped Areas on Eartlis Surface. 439 



humanity is a prey, and to meet them and conquer them. 

 In Africa we have a totally different set of enemies 

 to meet, from lions and snakes down to the invisible 

 organisms that produce those forms of malaria, aniemia, 

 and other diseases characteristic of tropical countries. 

 He admits that these are more or less due to heat, to the 

 nature of the soil, and other tropical conditions, but that 

 if once we knew their precise nature and modes of 

 working we should be in a position to meet them and 

 conquer them. It may be so, but this is a result that 

 could only be reached after generations of experience and 

 investigation, and even Dr. Sanibon admits that the 

 ultimate product of European acclimatization in Africa 

 would be something quite different from the European 

 progenitors. What is wanted is a series of carefully 

 conducted experiments. 



I have referred to the Blantyre highlands. In British 

 East Africa there are plateaus of much greater altitude, 

 and in other parts of Central Africa there are large areas 

 of 4,000 feet and over above sea level. The world may 

 become so full that we may be forced to try to utilize 

 these lofty tropical regions as homes for white people 

 when Canada and Australia and the United States 

 become over populated. As one of my predecessors in 

 this chair (Mr. Eavenstein) tried to show at the Leeds 

 meeting some years ago, the population of the world will 

 have more than doubled in a century, and about 180 

 years hence will have quadrupled. At any rate, here is a 

 problem of prime importance for the geographer of the 

 coming century to attack. With so many energetic and 

 intelligent white men all over Africa, it should not be 

 difhcult to obtain the data which might help toward 

 its solution. 



NORTH AMERICA. 



I have dwelt thus long on Africa, because it will really 

 be one of the great geographical problems of the coming 



