98 GREASE. 



that the contents are proportional, cannot be 

 denied ; thefe pofitions 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 

 contrading power of the veflels ading upon, 

 their own contents, exclufive of the affifting 

 mufcular compreflion mentioned by the author 

 above quoted, which (in the fyftem of circu- 

 lation) can only prove the fecondary confider- 

 ation. I do not mean to enter into tedious and 

 unentertaining difquiiitions upon the Jaw^s of 

 nature and motion^ but hope (and naturally con- 

 clude) every reader will coincide with me in 

 one opinion — that thefe veffels are as fully ade- 

 qu'c^te to the offices affigned them in the ex- 

 tremities, as thofe whofe capacities have fixed 

 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 i and doubt not, in the inveftigation of 

 the fubjedt, we fl:iall be able to produce more 

 fatisfaftory reafons for the appearance and 

 4 progrefs 



