SALT. SULPHUR. MERCURY. Unpleasant and bitter. Sweet. Acid. Body. Soul. Spirit. Matter. Form. Idea. Patient. Agent. Informant or movent. Art. Nature. Intelligence. Sense. Judgment. Intellect. Material. Spiritual. Glorious. This is taken from Beguin, who explains that the mercury, sulphur, and salt of this classification are not those “mixt and concrete bodies such as are vulgarly sold by merchants. Mercury, which combines the elements of air and water, Sulphur represents Fire, and Salt, Earth.” “But the said principles, to speak properly, are neither bodies; because they are plainly spiritual, by reason of the influx of celestial seeds, with which they are impregnated: nor spirits, because corporeal, but they participate of either nature; and have been insignized by Phylosophers with various names, or at the least unto them they have alluded these.” Instances of the combination of these principles are given. If you burn green woods, you first have a wateriness, mercury; then there goes forth an oleaginous substance easily inflammable, sulphur; lastly, a dry and terrestrial substance remains, salt. Milk contains a sulphurous buttery substance; mercurial, whey; saline, cheese. Eggs: white, mercury, yolk, sulphur, shell, salt. Antimony regulus, mercury, red sulphur conceiving flame; a salt which is vomitive. [Illustration: GEORGE ERNEST STAHL. Born at Anspach, 1660; died at Berlin, 1734. Stahl was the originator of the “phlogiston theory” which generally prevailed in chemistry until Lavoisier disproved it in the last quarter of the 18th century. ] Nowhere do you get these principles pure. Mercury (the metal) contains both sulphur and salt; so with the others. Becker, the predecessor of Stahl, was not quite satisfied with the orthodox opinion, and improved upon it by limiting the elements to water and earth; but he recognised three earths, vitrifiable, inflammable, and mercurial. The last yielded the metals. Stahl was inclined to go back to the four elements again, but he had his doubts about their really elementary character. He, however, concentrated his attention on fire, out of which he evolved his well-known phlogiston theory. This substance, if it was a substance, was conceived as floating about all through the atmosphere, but only revealing itself by its effects when it came into contact with material bodies. There was some doubt whether it possessed the attribute of weight at all; but its properties were supposed to be quiescent when it became united with a substance which thereby became phlogisticated. It needed to be excited in some special way before it could be brought again into activity. When combined it was in a passive condition.