of 'various refractory Bodies, 333 



it became agglutinated by the heat, and was then 

 perfectly fufed into a colourlefs glafs. 



Alumine — 'perfectly fufed, into a milk white enamel. 



Barytes — -fufed immediately, with intumescence, ow- 

 ing to water, as obferved by Lavoifier ; it then be- 

 came folid and dry, but foon melted again into a per- 

 fect globule, a greyifh white enamel. 



Strontites — the same. 



Glucine perfectly fufed into a white enamel. 



Zircon — the fame. 



LiME-in fmall pieces, it was immediately blown off from 

 the charcoal ; to prevent this, as well as to obviate 

 the suspicion, that any foreign matter had contributed 

 to its fufion, the following expedient was reforted 

 to. A piece of H me, from the Carrara marble, was 

 flrongly ignited, in a covered platinum crucible ; 

 one angle of it was then fhaped into a fmall cylinder, 

 about one fourth of an inch high, and fomewhat 

 thicker than a great pin : the cylinder remained in 

 connection with the piece of lime : this was held by 

 a pair of forceps, and thus the fmall cylinder of lime 

 was brought into contact with the heat, without 

 danger of being blown away, and without a poffibili- 

 ty of contamination ; there was this farther advan- 

 tage, (as the experiment was delicate and the deter- 

 mination of the refult might be difficult, that, as the 

 cylinder was held in a perpendicular pofition, if the 

 lime did really melt, the column muft fmk and be- 

 come, at lead to a degree, blended with the fuppor- 

 ting mafs of lime. When the compound flame fell 

 upon the lime, the fplendor of the hght was perfectly 

 infupportable, by the naked eye, and when viewed 

 through deep coloured glaffes ( as indeed all thefe 

 experiments ought to be, ; the lime was seen to be- 

 come rounded at the angles, and gradually to sink, 

 *till, in the courfe of a few feconds, only a fmall glo- 

 bular protuberance remained, and the mafs of fup- 

 porting lime was alfo fuperficially fufed at the bafe of 

 the column, through a fpace of half an inch in diara' 



