(f various refractory Bodies. S3t 



Topaz — of Saxony, melted with ftrong ebullition, and 



became a white enamel. " It is infufible before the 



blow pipe, but melts when borax is added.'' ( Ibid 498.) 



Sappar or KyanitCf— perfectly and inilantly fufed, with 



ebullition, into a white enamel. 



" It remains perfectly unaltered before the flame 

 of the blow pipe even when excited by oxygen gas." 

 (Ibid 499.) 

 Corundum — of the Eaft Indies, was immediately and 



perfeftly fufed, into a grey globule. 

 Corundum — of China, the fame with active ebulHtion, 

 Corundum" is not fufed by the flame of the blow- 

 pipe on charcoal even when foda or borax is added 

 to it.'* (^Ibid 495.) 

 Zircon — of Ceylon melted, with ebullition, into a white 

 enamel. " It is not melted alone before the flame of 

 the blow pipe, but if borax is added it forms a trans- 

 parent glafs." (Murray III. 539.) 

 Hyacinth — of Expailly fufed into a white enamel. 

 " It lofes its colour before the flame of the blow* 

 pipe, but it is not fufed ; it melts with borax into a 

 transparent glafs." (Ibid 540.) 

 Cinnamon stone— inftantly fufed into a black globule 



with violent ebullition. 

 Spinelle Ruby— fufed immediately into an elliptical 

 red globule. " It does not melt before the blow pipe 

 but is fufed by the aid of borax. [Ibid 497.] 



Steatite — melted with flrong ebullition into agreyifli 

 flag. — " It does not melt before the blow pipe, but 

 becomes white and very hard." [Ibid 482.] 

 Porcelain, common pottery, fragments of Heflian cruci^ 

 bles, Wedgwood's ware, various natural clays, as pipe 

 and porcelain clay, fire and common brick, and com- 

 pound rocks, &c. were fufed with .equal eafe. 



During the action of the compound flame upon the 

 alkaline earths, provided they were fupported by char* 

 coal, difl:in6t globules often rolled and darted out from 

 the ignited mafs, and burnt, fometimes vividly, and 

 with peculiarly coloured flame. From the nature of the 



