98 GREASE. 



that the contents are proportional, cannot be 

 denied : thefe poiitions being admitted, it cer- 

 tainly fliall follow, the lefs the weight or fub- 

 ftance, the lefs muft be the force required 

 to give it motion : this force is retained in the 

 contrafting power of the veffels adling upon 

 their own contents, exclufive of the affifting 

 mufcular compreffion mentioned by the author 

 above quoted, which (in the fyftem of circu- 

 lation) can only prove the fecondary confide r- 

 ation. I do not mean to enter into tedious and 

 unentertaining difquifitions upon the laws of 

 nature and motion ^ but hope (and naturally 

 conclude) every reader will coincide with me 

 in one opinion — that thefe veflels are as fully 

 adequate to the offices affigned them in the 

 extremities, as thofe whofe capacities have fix- 

 ed them in the more noble parts. 



This truth being allowed (as by every" 

 intelligent reader it muft be), I confider 

 NATURE totally exculpated from the accufation 

 of infufficiency in the execution of her own 

 laws; and doubt not, in the inveftigation of 

 the fubjedl, we Ihall be able to produce more 

 fatisfaftory reafons for the appearance and 



progrefs 



