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(ading internally), or afFedts the fkin, the hair, &c. (ading 

 externally) ; mineral particles alfo impregnate the air, and 

 have confequent influence not only on health, but on appear- 

 ance. — This caufe might be traced ad infinitum. 



Manners of life vary fo greatly among mankind, that 

 much mud be attributed to them. Cleanlinefs permits free 

 perfpiration, and a clear fkin; upon this Europeans value them- 

 felves ; while Hottentots clothe themfelves i:i greafe, and of 

 tawny make foot-black complexions. Thofe always in fmoke 

 muft needs be fmoke-dried, thofe always fedentary feeble and 

 inaclive, thofe always fcorched by the fun fhrivelled, thofe 

 expofed to the feafons weather-beaten ; thefe efFeds are fo 

 evident in the various clalTes of people which compofe our 

 own nation, that little imagination is necefTary, to allow their 

 full force among thofe tribes of mankind whofe days are 

 pafTed in conftant fubjedion to any one of them. 



Customs and manners follow clofely on modes of life : 

 what was at fii'ft arbitrary becomes at length national, wha% 

 has been efteemed a beauty determines the wi(hes of all, and 

 by degrees their features ; the power of imagination is not 

 eafily calculated. Religious rites, tyrannical impofition, local 

 difeafes, conftant depreflion of mind, fuperftition (which is 

 always gloomy) and other habitual manners, greatly influence 

 the exprcflijn of the countenance. 



Food, above all, is the caufe of variety, by its quantity or 

 Its quality. If little and ill fupplied, can it afford nutriment 

 adequate to the confumption of the body ? Can it fill the 

 parts, and furnilh throughout the whole, thofe juices requifite 



3 ^^ 



