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261 



The operatio7i of the Sun is undoubtedly another great caufe of the 

 dark hue in- negroes ; we- find that nations in the farn? proportion, 

 as they approach the equator, likewife become darker coloured ; 



CAUSES 

 OF VARI- 

 ETIKS. 



however, this ob-ft 



quite 



verfaL and ouffht 



o 



be 



modified under many eircumflances. Inhabitants of iflands are fel- 



dom fo black 



thofe of ^reat continents : in Africa, between 



t> 



tropics, the Eafterly winds prevail the moft ; and as in Abyifi- 



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nia theie winds come over a large ocean, where they are miti- 

 gated and cooled in their pafTagc,. the inhabitants of that, country 



F 



are not fo black as thofe about Senegal^ which is fituated in the 

 broadefl: part of Africa, and. where the Eailerly wind having pafTed 

 over the burning fands of the immenfe continent, is become infi- 

 nitely more fiery and parching than in any other part. A higher ex- 

 pofure above the fiirface of the fea, makes a great diiference in the 

 temperature of the air; the inhabitants of Quito in Peru, though 

 living under the line, are by no means black or fwarthy. The vi- 

 einity of the fea,,. and its refrefliing and gendy fanning, breezes, 



/ 



contribute gceatly to mitigate the- power of a tropical fun. This^ 

 caufe cannot be applied to the difference of colour in the Taheiteans 

 and the Mallicolefe, as both nations enjoy the fame advantage. 



But th.Q peculiar modes of living likewife, ftrongly co-operate with 

 the above caufes, in producing the many changes of colour in the 

 human, fpecies.. The Taheiteans are conftantly cleanly,, and prac- 



tife 



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