Professor Bailey, examining these grains microscopically, found that they were casts of the interior cavities of Foraminifera, consisting of a mineral known as Glauconite, which is a silicate of iron and alumina.

Crossing from these shallower regions occupied by the ooze into deeper soundings, we find, universally, that the calcareous formation gradually passes into, and is finally replaced by, an extremely fine pure clay, which occupies, speaking generally, all depths below 2,500 fathoms, and consists almost entirely of a silicate of the red oxide of iron and alumina.

But the lime usually employed must be mixed with more or less sand to make it set hard: a mysterious process, of which it will be enough to tell the reader that the sand and lime are said to unite gradually, not only mechanically, that is, by sticking together; but also in part chemicallythat is, by forming out of themselves a new substance, which is called silicate of lime.

He caused this polarized light to pass through a plate of heavy glass made from a boro-silicate of lead.

Being a mineral, it cannot be appropriated to animal uses, without being decomposed and transformed into an organic condition; but in the numerous species of plants whose stalks require stiffening against the winds,in the grasses and canes, including all our grains, the sugar-cane, and the bamboo,a silicate (an actual flint) is taken up by the roots and stored away in the stalks as a stiffener.

A fireproof whitewash can be readily made by adding one part silicate of soda (or potash) to every five parts of whitewash.

The Colloid chemistry of the silicate minerals.

The Colloid chemistry of the silicate minerals.

Chemistry proved that too small a quantity of silicate made John Barleycorn weak in the knee; ammonia, animal phosphates, nitrogen, and so on, were mere names to many ignorant folk.

A general analysis of four samples of soil from Merced, California, has given the following results: SAMPLE A. Organic matter (Humus) 5.5 Soluble inorganic matter 11.75 Insoluble silica and silicates 82.75 100.00 SAMPLE B. Organic matter (Humus)

KAOLIN, a fine white clay, a hydrous silicate of alumina, which does not colour when fired; used in making porcelain; called also China clay.

sea-foam), a fine white clay, a hydrate-silicate of magnesia, supposed, as found on the sea-shore in some places, to have been sea-foam petrified.