| http://www.w3.org/ns/prov#value | - One is, of course, prepared to encounter two difficulties: first, as regards the rough product, the crystals", they are good conducting, and it is a fact that conductors do not phosphoresce; second, the powder, being exceedingly fine, would not be apt to exhibit very prominently this quality, since we know that when crystals, even such as diamond or ruby, are finely powdered, they lose the proper
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