Imitation of Precious Stones.
The preceding instance is sufficient to prove that chemistry had made great progress among the Egyptians. History affords similar instances of extraordinary attainment by this wonderful people, who were so ingenious and industrious, that even their lame, blind, and maimed were in constant employment. With all this, they were so noble-minded, as to inscribe their discoveries in the arts and sciences upon pillars reared in holy places, in order to omit nothing that might contribute to the public utility. The emperor Adrian attests this in a letter to the consul Servianus, upon presenting him with three curious cups of glass, which, like a pigeon’s neck, reflected, on whatever side they were viewed, a variety of colours, representing those of the precious stone called obsidianum, and which some commentators have imagined to be cat’s-eye, and others the opal. In this art of imitating precious stones, the Greeks, who derived their knowledge from the Egyptians, were also very skilful. They could give to a composition of crystal all the different tints of any precious stone they wanted to imitate. They remarkably excelled in an exact imitation of the ruby, the hyacinth, the emerald, and the sapphire.
Gold—Nitre—Artificial Hatching, &c.
Diodorus Siculus says, that some of the Egyptian kings had the art of extracting gold from a sort of white marble. Strabo reports their manner of preparing nitre, and mentions the considerable number of mortars of granite, for chemical purposes, that were to be seen in his time at Memphis. They likewise, by artificial means, hatched the eggs of hens, geese, and other fowls, at all seasons.
Medical Chemistry.
Egyptian pharmacy depended much upon chemistry; witness their extracted oils, and their preparations of opium, for alleviating acute pains, or relieving the mind from melancholy thoughts. Homer introduces Helen as ministering to Telemachus a medical preparation of this kind. They also made a composition or preparation of clay or fuller’s earth, adapted to the relief of many disorders, particularly where it was requisite to render the fleshy parts dry, as in dropsy, &c. They had different methods of composing salts, nitre, and alum, sal cyrenaïc or ammoniac, so called from being found in the environs of the temple of Jupiter Ammon. They made use of the litharge of silver, the rust of iron, and calcined alum, in the cure of ulcers, cuts, boils, defluctions of the eyes, pains of the head, &c.; and of pitch against the bite of serpents. They successfully applied caustics. They knew every different way of preparing plants, or herbs, or grain, whether for medicine or beverage. Beer, in particular, had its origin among them. Their unguents were of the highest estimation, and most lasting; and their use of remedies, taken from metallic substances, is so manifest in the writings of Pliny and Dioscorides, that it would be needless, and indeed tedious, to enter upon them. The latter especially often mentions their metallic preparations of burnt lead, ceruse, verdigrise, and burnt antimony, for plasters and other external applications.
All these chemical preparations the Egyptians were acquainted with in their pharmacy. The subsequent practice of the Greeks and Romans presents a field too vast to be observed on. Hippocrates, the contemporary and friend of Democritus, was remarkably assiduous in the cultivation of chemistry. He not only understood its general principles, but was an adept in many of its most useful parts. Galen knew that the energy of fire might be applied to many useful purposes; and that, by the instrumentality of it, many secrets in nature were to be discovered, which otherwise must for ever lie hid; and he instances this in several places of his works. Dioscorides has transmitted to us many of the mineral operations of the ancients, and in particular that of extracting quicksilver from cinnabar; which is, in effect, an exact description of distillation.
[507] The ancients also understood gilding with beaten, or water gold.—Æs inaurari argento vivo, legitimum erat. Plin. Hist. Natur. lib. xxxiii. c. 3. Vitruv. lib. vii. c. 8.