202 Mr. Delaval mi the Caufe »f the 



pofition, does not, in any degree, mix with 

 water. 



Refinous fubftances do not combine with 

 water, becaufe their aqueous part is not in fufli- 

 cient quantity to ferve, as a medium, for the 

 union of their phlogifton. 



In gums, the relative proportion of phlogifron 

 is much lefs than in refins, and that of the water 

 is much greater: and by the intervention of 

 their aqueous part, gums are readily mifcible 

 with water. 



Refins, when united with a due proportion of 

 gum, are by its mediation, alfo rendered folu- 

 bie in water. But, iT a lefs proportion of the gum 

 be joined with the refin, only a part of the com- 

 pound, refuking from this union, is difpofed to 

 mix with water, and a refiduum is left, which is 

 incapable of being diflblved in any aqueous 

 liquor. 



Fixed air feems to refemhle thefe matters, 

 which do not poffefs a fufficient quantity of the 

 aqueous medium, to render them totally folublc 

 in water. For, after a given portion of fixed 

 air has been imbibed by water, a refiduum re- 

 mains, which is incapable of being abforbed 

 by it, and is called phlogifticated air. 



This air may be formed from fixed air, not only 



by the fubtraftion of water, but by the addition of 



the inflammible principle : as when phlogifton is 



,Commu.nicated to fixed air by cleftric fparks, or 



the 



