Part 38 (1/2)

_Chemist_, one who understands the science of chemistry

Of which of these Silobe principally composed?

Of flint or silex, lirees of coreatest parts of the mountains and plains, and the whole of e commonly understand by soil,nearly all of the solid portions of the world, are constantly n matters, as metals, (particularly iron,) and acids, (as carbonic acid)

What are the properties of Silex?

Silex, or pure flint, will not dissolve in water, nor can it be melted by itself in any heat; but colass It is the principal ingredient of most of the precious stones

What are the chief uses of Silex?

It is the most durable article for the forredient in earthenware, porcelain, and celass and vitreous substances The e; the basis used is a very hard and pure silex

_Basis_, that part of any round or base; the first principle or element of a substance

Describe the properties of Lime

It is of a white color, and possesses a hot, caustic taste It forreen; will not fuse; gives out a quantity of caloric when united ater; and absorbs carbonic acid when exposed to air Lime is very useful in the arts and manufactures, in medicine, &c The farmers use it as : a ter hich they are brought in contact

In what state is Lime found in nature?

Never native, but coenerally with an acid, and most plentifully with carbonic acid, as in chalk, etables, and is the basis of animal bones; it likewise occurs in the water of the ocean, and in that of all springs and rivers The_lime_, from chalk, marble, limestone, oyster-shells, &c, has already been described in a foril, or pure clay, also called _alu the basis of alum, is soft to the touch, adhesive, and emits a peculiar odor when moistened;--forms a paste ater, and hardens in the fire

Its uses are so various and important, that it would have been alree of civilization, if it had not been given him by nature in such abundance Its uses have already been described in the arts of brick-, pottery, &c Besides these three principal pri several properties in co its different and specific properties, and evidently designed by nature for different purposes of utility

_Specific_, belonging to its particular species

_Utility_, usefulness

What is a Volcano?

An opening in the surface of the earth, or in a mountain, from which are ejected smoke, flames, stones, lava, &c Beneath the outer crust of the earth inflammable materials appear to exist, which different causes excite into coin to the metals and minerals which fornited, expand,--shake the rocky foundations,--and soh, produce all the destructive effects of earthquakes They break forth under the sea, as well as the land, and throw upan eruption of Vesuvius, AD 79, three cities, Herculaneum, Pompeii, and Stabiae, were overwhelmed, and lay buried beneath the matter ejected from the volcano until within a few years, when excavations were made and many relics discovered;--streets, houses, papyri, (rain, fruit, bread, medicines, &c

&c, all in a remarkable state of preservation, have been found just as they were left by the terrified inhabitants at the ti forth with violence