CHAPTER IX. ALCHYMICAL AND ASTROLOGICAL CHIMERA. Having so far explained the fragile basis on which human knowledge may be said to have depended, during the obscurity and barbarity of the middle ages, when the progress of true knowledge was obstructed by the most absurd fancies, and puerile conceits: when conjectures, caprices, and dreams supplied the place of the most useful sciences, and of the most important truths, the subsequent illustrative reflections may serve as a guide to direct the attention of the reader to other delusions, which arose out of the general chaos. Chemistry, a science so essentially requisite to explain the phenomena of known and unknown substances, was studied chiefly by jugglers and fanatics;--their systems, replete with metaphysical nonsense, and composed of the most crude and heterogeneous materials, served rather to nourish superstition than to establish facts, and illustrate useful truths. Universal remedies, in various forms, met with strenuous advocates and deluded consumers. The path of accurate observation and experiment was forsaken: instead of penetrating into the mysterious recesses of nature, they bewildered themselves in the labyrinth of fanciful speculation; they overstepped the bounds of good sense, modesty, and truth; and the blind led the blind. The prolongation of life too was no longer sought for in a manner agreeable to the dictates of nature; even this interesting branch of human pursuits was rendered subservient to chemistry, or rather to the confused system of alchymy. Original matter was considered as the elementary cause of all beings, by which they expected literally to work miracles, to transmute the base into noble metals, to metamorphose man in his animal state by chemical processes, to render him more durable, and to secure him against early decline and dissolution. Millions of vessels, retorts, and phials, were either exposed to the action of the most violent artificial heat, or to the natural warmth of the sun; or else they were buried in some dunghill or other fetid mass, for the purpose of attracting this _original matter_, or obtaining it from putrescible substances.