_Symbolical_, having the nature of signs or symbols--that is, representations of different things.

_Deciphered_, read, understood, made out.

_Unintelligible_, that cannot be understood.

_Expounded_, explained, interpreted.

Were Hieroglyphics employed before or after Alphabetic Writing?

They were undoubtedly employed at first from necessity, not from choice or refinement; and would never have been thought of, if alphabetical characters had been known. This style of writing must be reckoned as a rude improvement upon picture-writing, which had previously been used. Hieroglyphics were employed by the Egyptian priests in after times, as a kind of sacred writing, peculiar to themselves, and serving to give an air of mystery to their learning and religion, though fallen into disuse for other purposes.

What materials were employed by ancient nations in Writing?

The Eastern nations used tables of stone, bra.s.s, and wood, so that the characters were engraved instead of being written in the usual manner.

The instrument used in writing on wood, was made of metal, and called a _style_. For stone, bra.s.s, &c., a chisel was employed. When the bark and leaves of trees, skins, and other materials of a more pliant nature, superseded the above-named tables, the chisel and the style, or stylus, gave way to the reed and cane, and afterwards to the quill, the _hair_ pencil (as now used by the Chinese,) and the convenient lead pencil.

_Engraved_, inscribed with the graver, a tool used in engraving on stone, &c.

_Pliant_, yielding, easily bent.

Have not the various nations among whom this useful art has been cultivated, adopted different ways of arranging their written characters?

Yes. The Hebrews, Chaldeans, Syrians, Arabians, and Egyptians, begin each line on the right side, and write towards the left. The Greeks, Latins, and all European nations, write from left to right. The natives of China, j.a.pan, Cochin China, Corea, &c., write from the top to the bottom of the page.

Where are Cochin China, and Corea?

Cochin China is a country situated in Eastern Asia. Corea is a peninsula of Asia, subject to China.

What is meant by Science?

A clear and certain knowledge of anything founded on self-evident principles, or demonstration. The term is, however, more particularly applied to a systematic arrangement of the principles relating to any branch of knowledge, and is employed in this sense in opposition to art: thus the theoretical knowledge of chemistry is ranked as a science, but the practical part is called an art; thus it is sometimes spoken of as a science, sometimes as an art.

_Practical_, relating to action, not merely speculative.

What is Chemistry?

A science which enables us to discover the peculiar properties of natural bodies, either in their simple or compound state, and the elementary or first principles of which they are composed, by the processes of a.n.a.lysis and combination. Chemistry treats of those changes in natural bodies which are not accompanied by _sensible_ motions.

_Compound_, mixed.

_a.n.a.lysis_, a separation of a compound body into the several parts of which it consists.

Is not the knowledge of Chemistry very ancient?

Chemistry, as far as it regards the separating of metals from foreign matters in the ore, smelting and refining them, is of the highest antiquity; it is even supposed to have been understood and practised in the antediluvian world.

_Antediluvian_, before the flood.

What nation appears to have excelled in Chemistry in early times?

The Egyptians were no mean proficients in many chemical operations, especially in the arts of working metals, softening ivory, vitrifying flints, and imitating precious stones. Chemistry, however, experienced the common fate of all the arts, at the decline of the Eastern empire.

_Proficients_, those who have made great progress in any art or science.

By whom was it revived?

After having long lain buried, the famous Roger Bacon revived it; and from his time to the present day it has gradually progressed to a state of perfection. In former times, the art of chemistry consisted only in the knowledge of working metals, &c.; but in latter ages, its bounds have been greatly enlarged. The knowledge of Chemistry leads to many interesting and important discoveries, and the arts and manufactures are greatly indebted to its aid; indeed, it is requisite to be a good chemist, in order to attain to perfection in many of them.

_Requisite_, necessary.

By what other name has Chemistry been known?

It was sometimes called _Alchemy_; by which is properly understood a refined and mysterious species of chemistry, formerly much practised.

What were its objects?

The discovery of the art of converting metals into gold, including the search after the "Philosopher"s Stone," by which this change was to be effected; and the discovery of a panacea or medicine for the cure of all diseases.

What was the Philosopher"s Stone?

A substance, for numbers of years eagerly sought for, which was to convert metals, such as lead, copper, &c. into gold. This unknown substance was called the Philosopher"s Stone, probably on account of the number of learned men who engaged in the search after it.

[Ill.u.s.tration: UNITED STATES SIGNAL STATION, PIKE"S PEAK, COLORADO.]

Was this search successful?

No; but the delusion lasted several centuries, notwithstanding the failures, losses, and disappointments of those engaged in it. Indeed, so severe and ruinous were these, in many instances, that laws were pa.s.sed to forbid the study. In Germany, many of the alchemists who had the unfortunate reputation of possessing this wonderful stone were imprisoned and furnished with apparatus till they should purchase their liberty by making an ounce of gold.

_Delusion_, an error arising from false views.

_Apparatus_, a complete set of instruments or tools, by which anything is made, or any operation performed.

Was any gold ever produced by this method?