S36 Experiments on the Fufion 



*' It is infulible before the blow pipe, even when the 

 flame is excited by a ftream of oxygen gas." (Ibid, 

 519.) 



Smoky Quartz — or fmoky topaz melted into a col- 

 ourlefs globule. 



Beryl — melted inftantly, into a perfect globule, and 

 continued in a violent ebullition, as long as the flame 

 was applied, and when, after the globule became 

 cold, it was heated again, the ebullition was equally 

 renewed ; the globule was a glafs of a beautiful blue.? 

 ifli milky white. 



*' The beryl is melted with difficulty before the blow- 

 pipe alone, but ealily when borax is added." 



Emerald of Peru. (Ibid 511,) 



The fame, only the globule was green, and perfectly 



tranfparent. 



Olivin—- fufed into a dark brown globule, almoft black. 

 *' It can fcarcely be melted by the blow pipe without 

 addition." (^Ibid 534.) 



Vesuvian — inftantly melted into a beautiful green glafs. 

 " It melts before the blow pipe into a yellowifh glafs,'* 

 (Ibid 534.) 



Leucite — inftantly fufed into a perfectly tranfparent 

 white glafs ; the fufion was attended with ftrong eb- 

 uUition, and many ignited globules darted from it 

 and burnt in the air, or rolled out upon the charcoal 

 and then burned. Were they not potaffium ? This 

 ftone contains full 20 per cent of potafti : this hint will 

 be refumed below. 



•' It is not fufed before the blow pipe." (Murray III. 

 534.) 



Chrysoberyl— (Cymophane of Hauy) was immedi- 

 ately fufed into a greyifh white globule. "It is not 

 melted by the blow pipe," (Ibid 499.) 



A Chrystalized mineral. 



From Haddam, Connefticut, according to the Abbe 

 Hauy it is Chrysoberyl, according to Col. Gibbs, Co- 

 rundum : it fufed with ebullition, and fcintillations, 

 5ind produced a very dark globule almoft black. 



