BREEDING. 41 



f:eal whatever could in the leaft tend to an 

 additional difcovery upon the fubjed. 



Jt is not the purport of the prefent work 

 (nor is it at all applicable to the purpofe) 

 to enter into phy ileal refearches, leading 

 the reader through a long chain of philo- 

 fophical difquiiition upon Lewenhock's 

 microfcopic inveftigation of the anmalculce 

 contained in the fe7n-e?i of animals, founding 

 upon fuch inquiry a thoufand ronjeclures 

 refped:ing this abftrufe procefs of nature, 

 that may very much perplex the mind, but 

 can neither tend to entertain or improve the 

 judgment. 



Of as little confequence or advantage it 

 muft certainly prove, to attempt any exadt 

 decifion by what nice and undifcovered ope- 

 ration in the animal fyftem, a horfe is ren- 

 dered firft partially^ then totally blind by too 

 frequent or hard racing ; as w^ell as the very 

 common occurrence of a flallion's becoming 

 equally fo by too conftant and repeated cover- 

 ings though the ad; itfelf is a fpontaneous 

 effort of nature. 



However 



