Dr. Robinfon hi Anfwer to Mr. Ray. 



o IRj London, May ip. — 8f. 



I Received yours of the 12 th Inftant, and am fuffi- 

 ciently convinced that there are fix'd and certain 

 Principles in Nature, and fettled Lam of Motion : Yet 

 I have fome Reafon to believe that they are not im- 

 mutable, but that fome outward Violence and pre* 

 ternatural Caufes may alter them, tho' they are fel- 

 dom, or never, mutable in the .ordinary Courfe of 

 Things. If you pleafe, the Tranfmutatioii of the 

 Parts of Analyzed Bodies fhall be ftruck out of the 

 Chapter de Chytn. Plant. Analyfi partiurnq, refoluta- 

 rum Ufu* 



Mr* Kay's Anfwer to Dr. Robinfon. 



s4M I 



LAST Pofl: brought me yours o£ May ip. In 

 Anfwer whereto, feeing what you affert con- 

 cerning the Tranfmutation mcntion'd may be true, 

 and is fupported by good Authority, and your Opi-* 

 nion * I fee no Reafon it Aould be ftruck out. For 

 thofe Principles^ into which Bodies are immediately 

 refoluble by Fire, being inot primary, but compound 

 Bodies, it may confifl with my Opinion of certain 

 and fix'd firft: Principles well enough. 



Reading in the Philofoph. Tranfa&ions of March- 

 laft your Obfervations on fubterraneous Streams, I 

 find you miftaken in one of your Conje&ures con- 

 cerning Matter of Fa$v tf* at ls concerning that they 



call 



