OF FOSSILS. 



tlian the falts ; but have this peculiar quality of 

 being combuftible. 



$ XLVIII. Tq/le. 



TASTE, depending upon the fcnfibility of the 

 tongue, differs fo much in different pcrfons, that 

 what will excite powerful fen fat ions in one man 

 (hall not be at all perceptible to another. It 

 is evident, therefore, \ve arc to place but little 

 dependancc on this quality. 



XLIX. Solubility in Water* 



SOLUBILITY in water, confidercd generally, 

 is an unlimited property. In order to define it, 

 it will be necellary to attend to the Aate of divi- 

 iion of the body to be diflblvcd, and the quan- 

 tity and temperature of the menflruum cm- 

 ployed. 



Pulverization encrcafts the extent of furface ; 

 and in proportion as it does fo, the menitruum, 

 by coming into contact, in a greater number of 

 points, ads with more eflicacy. For this rcafon 

 large mailes immerfcd in a menflruum, are 

 fometimes very little, if at all corroded: When 

 divided intofmall pieces they oiler Icfs refinance; 

 and, if pulverised are entirely diflblvcd. It; 

 happens occafionally, however, that mechani- 

 cal diviiion docs not anfwer the end eflcduaily, 



P 3 and 



