CLIMATE 999 



with the greatest certainty. Algerian sheep have a natural 

 immunity against Anthrax. Some Indian cattle are highly 

 resistant though not completely immune to Einderpest, and 

 only exceptionally die from ' Surra.' The cattle of the 

 East Ceast of Africa are immune to tropical pyroplasmosis. 

 Wild cattle in the Fly Belts of Africa, also the Masai 

 donkeys, are immune to Tsetse. Texas cattle, and other 

 cattle reared in an infected country, have a high degree 

 of resistance to Bed Water. Bersian sheep show consider- 

 able immunity to Heart Water, while it is well known that 

 the native inhabitants of malarious districts have a natural 

 immunity to Fever, though, as in Bed Water of animals, they 

 are capable through the intermediate host of infecting new- 

 comers. 



Brobably this aspect of acclimatization is by far the 

 most important, as it is the indigenous diseases rather than 

 heat, cold, rain, wind, altitude, and change in diet, which 

 so enormously influence new arrivals in a country. 



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