Hare’s Blowpipe. 2a" 
Crark. Pure Oxide of Magnesium (Magnesia.) 
Fusion per se, extremely difficult. When the earth is 
made to adhere (by moisture with distilled water and sub- 
sequent desiccation) and placed upon charcoal it is fusible in- 
to a whitish glass; but the parts in contact with the char- 
coal acquire an imposing pseudo metallic lustre with a pur- 
ple coloured flame. 
Cuark. Hydrate of Magnesia (pure foliated Magnesia 
from America.) 
“This substance is incomparably refractory 5; with the 
utmost intensity of the heat of the gas blowpipe, it is ulti- 
mately reducible to a white opake enamel invested with a 
thin superficies of limpid glass. Its fusion is accompanied 
with a purple coloured flame. 
Experiments on Corundum. 
Silliman, page 112. “ Corundum of the East-Indies 
was immediately and perfectly fused into a grey globule.” 
“ Corundum of China the same with active ebullition.” 
Clark, page 56. Common corundum (greenish grey 
erystalized primary corundum from the East-Indies,) fusible 
but with difficulty, into a greenish coloured translucent glass 
nearly transparent, which at last becomes melted inio a 
bead like form ; or other wise exhibits upon its surface mi- 
nute cavities caused by the escape of gas during its fusion. 
This gas is probably the same which pure silica more 
abundantly exhibits. A slightly coloured greenish flame 
accompanies the fusion of corundum.” 
Experiments on Sappar. 
Silliman. ‘“ Sappar or kyanite perfectly and instantly 
fused with ebullition into a white enamel.” 
ed (when both substances had become cold.) This enabled me to make i! 
receive the greatest heat of the flame on renewing the process. The lime 
then melted into a liquid, which subsiding round the globule of platina, 
caused it to appear after cooling as ifset in enamel. 
