276 THE niESENT EVOLUTION OF MAN — PHYSICAL 



again only serves to keep them saturated with earth 

 poison. 



" It would not have been unreasonable to suppose 

 that the coolies, coming from an evidently malarious 

 country, would have acquired a high degree of immunity 

 to the malarial poison ; unfortunately such is very far 

 from being the case, and that this is so is entirely due 

 to th(3 causes mentioned above. Were the coolies to 

 live under conditions more sanitary than their present 

 ones, it is probable that they would show a certain 

 amount of immunity. There can, I think, be no doubt, 

 therefore, that, given a better sanitation, as regards the 

 coolies living on estates, a very sensible decrease in their 

 mortality would at once take place, and there would be 

 fiir fewer cases utterly broken down in health, with 

 sallow earthy complexions, unfit to work for a few 

 hours together." — Dr. Ozzard in the British Guiana 

 Medical Annual and Hospital Mcpori, 1893, p. 91. 



This ditference in habits between Europeans and 

 Asiatics explains why in India the former appear some- 

 times to suffer less than the latter. 



" The following is a table compiled by Waring of the 

 malarial sickness during ten years among the troops in 

 the Madras Presidency. 



" The native troops accordingly suffered from simple 

 malaria fever to a greater extent than even the Euro- 



pean, 



but the number of cases of remittent fever 



