192 A^. Delaval on the Cattfe of the ■ 



flance, in which that principle appears to exift 

 pure and unmixed. For all inflammable liquors 

 contain water: and all folid inflammable bodies 

 leave a refiduum of afhes, or coal, accordingly as 

 they are burnt in open, or in clofe vcflTels. 



Nor can any conlVituent parts of bodies pafs 

 through folid fubllanccs, except only phlogidon, 

 and light. And from their agreement in this re- 

 fpe£l, the identity of thefe fubtile principles is 

 farther confirmed. ». 



From the native form, and conflituent matter 

 of diamonds, may they not be properly denned 

 cryftaUized ^hlogijlon ? 



The chemical experiments, refpeding the in- 

 flammable nature of diamonds, carry with them 

 the greater clcarnefs and convidion, as the philo- 

 fophers, who m^de them, were entirely unpreju- 

 diced in their inquiries on that kibjetH: : for they 

 do not feem to have been aware that Sir Ifaac 

 Kewton had difcovered, from optical obfervation, 

 the fame truth to which they were led by the chy- 

 mical phenomena. 



The folvent power of phlogifton, whether ob- 

 tained from terreftrial bodies, or proceeding im- 

 mediately from the light of the fun, is manifeft 

 in various inftances fimilar to thofe which have 

 been hitherto explained. 



Silk is whitened by the phlogiftic vapours of 

 fulphur : and this operation does not appear to 



differ 



