49 2 



ILLUSTRxVnONS OF THE 



arth may be diffolved or fufpended in 5 



gtit of 



Taking this for the extreme degree of infolu- 

 bility of mineral fubflances, (though there are 

 many of which the infolubility is abfolute, or, to 



fpeak 



giiage of calculation, infinitely 



great), we may fuppofe the infolubility of all the 

 reft, or the quantities of water in which the 

 diffolved, to be ranged in a 



defcend 



fcal 



from 500 to o, the extreme deg 



V 



f deliquef- 



cence. 



Then, taking th 



thmetical mean be 



thefe extremes, it will give us 250, as th 



proportion of water in which n 

 may at an average be diffolved 

 rage is much lefs than the trut 

 tity of liliceous earth is great 

 any of the reft 



a 



fubft 



But th 



ave 



for the quan- 

 iomparifon of 



d the mineral fubft 



th 



extremely foluble in water are but in a fmall 



quantity 



therefore 



fuppofe mineral 



bodies, at a medium, to be foluble in 25 



their own weight of 



we make a fuppofi 



extremely favourable to the Nep 



ftem. 



431. This is the proportion between the weight 

 of the folvent, and of the fubftances held in folu- 



have the proportion of their hulk 



we 



may fuppofe the fpecific gravity of mineral bo 

 dies in general to be to that of water as 5 to 2 



and then 



have the ratio of b 



f 



250. 



