Silicon dioxide, by Emily Hahn.

Phosphides of iron, zinc, etc., were next introduced, and gave, besides carbon and other impurities, a residue containing a large percentage of phosphorus, which differed from ordinary phosphorus with respect to its insolubility in carbon disulphide, and which resembled the reaction in the case with silicon-eisen rather than that of the boron compound, insomuch that a large quantity of the phosphorus had passed into solution.

A small quantity only of silicon separates in the uncombined form, the greater quantity separating in the form of silica, SiO{2}, the amorphous silicon so obtained apparently being more prone to oxidation than the boron so obtained.

manganese, and have stood three and a half years' wear without a single one being broken; while those of silicon steel with 0.106-0.144 per cent.