Hare’s Blowppe. 295 
Clark. Here a different process is necessary ; the revi- 
val of the metal is rendered more difficult owing to the pul- 
verulent state of the earth. The particles must be made to 
adhere before fusion can be accomplished, and this oxyde 
being much more refractory than the preceding is almost in- 
fusible per se even with the aid of the vas blowpipe.” 
Thus he admits that a substance is almost infusible in his 
hands which has been repeatedly fused under mine. 
Experiments and observations on the fusion, volatilization 
and combustion of the perfect metals. 
Hare, page 305. “Had I sufficient confidence in my 
own judgment I should declare that gold, silver and platina 
were thrown into a state of ebullition by exposure on car- 
bon to the gaseous flame ; for the pieces of charcoal on 
which they were exposed became washed or gilt with de- 
tached particles of metal in the parts adjoining the spots 
where the exposure took place. Some of the particles of 
the metal thus detached exhibited symptoms of oxidation.” 
Combustion of pure Gold. 
Clark, page 90. “ As this experiment affords decisive 
evidence of the combustion of gold, and of course its com- 
bination with oxygen, and also exhibits the oxyde under a 
very beautiful appearance, it may be considered as one of 
the most pleasing experiments with the gas blowpipe.” 
Experiments on Platinum particularly. 
Hare, page 304. “ Platina was fused by exposure on car- 
bon to the combustion of hydrogen gas and atmospheric air. 
But the fusion of this metal was rapidly accomplished by 
the gaseous flame, either when exposed to it on carbon or 
upon metallic supports. me ee : 
A small quantity of this metal in its native granular form 
being strewed in a silver spoon and passed under the gase- 
ous flame, the tract of the flame became marked by the ag- 
glutination of the metal ; and when the heat was for some 
ume continued on a small space, a lump of fused platina be- 
fame immediately formed. About two penny weights of 
