The Journal of microscopy and natural science . thereremains its physical qualities to be investigated. First in import-ance is its hardness, which distinguishes it at once from any otherstone. It is the hardest substance in nature, and can only bescratched by itself, while by it everything can easily be is this quality of supreme hardness that gives the Diamond itsvalue to the engineer for rock-boring, the glazier for glass-cutting,the miller for dressing his mill-stones, and the lapidary for cuttingother stones. The specific gravity of the Diamond is 3-55, being character-isticall
The Journal of microscopy and natural science . thereremains its physical qualities to be investigated. First in import-ance is its hardness, which distinguishes it at once from any otherstone. It is the hardest substance in nature, and can only bescratched by itself, while by it everything can easily be is this quality of supreme hardness that gives the Diamond itsvalue to the engineer for rock-boring, the glazier for glass-cutting,the miller for dressing his mill-stones, and the lapidary for cuttingother stones. The specific gravity of the Diamond is 3-55, being character-istically light (although so much harder, it is lighter than theSapphire). This, in conjunction with its great refractive power, asbefore stated, first led to the theory that it was combustible. Ofits optical properties, I have not space in this paper to say morethan that it refracts light more than any other gem, which quality,with its capacity, thanks to its hardness, of receiving the brightest Journal o| Microscopy. Vol. 3,. PLU. i w ?*^ 9<.ji;. ife^ .Mt^ ??
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