protoxide

The ferruginous bacteria (leptothrix ochrocea) store up oxyhydrate of iron (by the oxydation of carbonic protoxide of iron).

This arises from the peroxidation of the iron, to whose protoxide they owe their tint.

They are red, lamellated, very heavy, and closely resemble protoxide of copper.

They consist of silicate of alumina, of lime, protoxide of iron; the red contain some silicate of copper.

When the metal is very pure and free from protoxide, these cakes may be obtained very thin, one 24th of an inch for example.