^'?2 Majbkv anticipated by Hoole. 



the diaphanous medium of the air, the action or pulfe of 

 light, which, what it is, I have elfewhcre already (hewn. 



" Fifthly, that the difiblution of fulphureous bodies is 

 made by a fubftahce inherent, and mixt with the air, that is 

 like, if not the very lame with that which is fixt in falt- 

 peter, which by multitudes of experiments that may be made 

 m ith faltpeter, will, I think, moft evidently be demonftrated. 



" Sixthly, that in this diffolution of bodies by the air, a 

 certain part is united and mixt, or diffolved and turned into 

 the air, and made to fly up and down with it in the fame 

 manner as a metalline, or other body diffolved into any men- 

 ftruums, does follow the motions and progreffes of that men- 

 ftruum till it be precipitated. 



" Seventhly, that as there is one part that is diflbluble by 

 (he air, lb are there other parts with which the. parts of the 

 air mixing and uniting do make a coagulum, or precipita- 

 tion, as one may call it, which caufes it to be feparated from 

 the air: 'nut. this precipitate is fo light, and in fo fmall and 

 rarified or porous clufters, that it is very volatile, and is eafily 

 carryed up by the motion of the air, though afterwards, when 

 the he^t and agitation that kept it rariiied ceafes, it eafily 

 condenfes, and commixt with other indiffoluble parts, it 

 flicks and adheres to the next bodies it meets withall ; and 

 this is a certain fait that mav he extracted out of foot. 



" Eighthlv, that many inditToluble parts being very apt 

 .-.nil prompt to be rariiied, and fo, whilft they continue in 

 that heat and agitation, are lighter than the ambient air, are 

 thereby thruft and carryed upwards with great violence, and 

 by that means carry along with therm, not only that fa line 

 concrete I mc ntioned before, but many terreftrial, or indif- 

 foluble and irrarifiable parts, nay, many parts alio which are 

 diflbluble, but are not fullered to ftay long enough in a fuf- 

 ficient heat to make them prompt and apt for that action. 

 And therefore we find in foot, not only a part that, being 

 eentinued longer in a competent heat, will be diffolved by 



the 



