292 Hare’s Blowpipe. 
Clark, page 57. “* This mineral owing to its refractory 
nature was used by Saussure as a supporter in experiments 
with the common blowpipe. It fuses very readily into a 
snow white frothy enamel.” 
Experiments on Zircon. 
Silliman, page 112. Zircon of Ceylon, melted with 
ebullition into a white enamel.” 
Clark, page 58. ‘ One of the most refractory substan- 
ces, exposed to the heat of the gas blowpipe it becomes 
first opaque and of a white colour ; and afterwards its super- 
ficies undergoes a partial fusion and exhibits a white opaque 
enamel resembling porcelain.* 
Experiments on the Spinelle Ruby. 
Silliman, page 112. ‘“Spinelle ruby fused immediately 
into an ellipitical red globule.” 
Clark, page 58. ‘‘ Fuses readily and undergoes a partial 
combustion and volatilization with loss of colour and of 
weight. One of the solid angles of an octahedral chrystal 
was entirely burned off, and volatilized in one of these ex- 
periments.” 
Experiments on Silex, Alumine, Barytes. 
Hare, page 304. ‘* By exposure to the gaseous flame 
either on supports of silver or of carbon, barytes, alumine, 
and silex were completely fused. The products of the fu- 
sion of alumine and silex were substances very similar to 
each other and much resembling white enamel.” 
Silliman, page 109. ‘Silex, being in a fine powder it 
was blown away by the current of gas, but when moistened 
with water it becomes agglutinated by the heat and was then 
perfectly fused into a colourless glass.” 
Clark, page 59. ‘‘ Pure precipitated silica (peroxide of 
silicium) becomes instantly fused into an orange coloured 
transparent glass. The colour may be due either to the 
*JT might say here with truth, Professor Clark in England was unable to 
fuse zircon in his mode of operating with the gas blowpipe. 
