As the author goes on to deal with the various compounds or derivatives from antimony, it is abundantly clear that he writes from practical experience. He describes the Regulus of Antimony (the metal), the glass (an oxy-sulphide), a tincture made from the glass, an oil, an elixir, the flowers, the liver, the white calx, a balsam, and others. Basil Valentine’s scathing contempt for contemporary medical practitioners calls for quotation. “The doctor,” he says, “knows not what medicines he prescribes to the sick; whether the colour of them be white, black, grey, or blew, he cannot tell; nor doth this wretched man know whether the medicament he gives be dry or hot, cold or humid.... Their furnaces stand in the Apothecaries’ shops to which they seldom or never come. A paper scroll in which their usual Recipe is written serves their purpose to the full, which Bill being by some Apothecary’s boy or servant received, he with great noise thumps out of his mortar every medicine, and all the health of the sick.” Valentine concludes his “Triumphal Chariot” by thus apostrophising contemporary practitioners:--“Ah, you poor miserable people, physicians without experience, pretended teachers who write long prescriptions on large sheets of paper; you apothecaries with your vast marmites, as large as may be seen in the kitchens of great lords where they feed hundreds of people; all you so very blind, rub your eyes and refresh your sight that you may be cured of your blindness.” In the same treatise Basil Valentine describes spirit of salt which he had obtained by the action of oil of vitriol on marine salt; brandy, distilled from wine; and how to get copper from pyrites by first obtaining a sulphate, then precipitating the metal by plunging into the solution a blade of iron. This operation was a favourite evidence with later alchemists of the transmutation of iron into copper. According to some of his biographers Basil Valentine was born in 1393; others are judiciously vague and variously suggest the twelfth, thirteenth, or fourteenth century. That he was a Benedictine monk, he tells us himself, and several monasteries of the order have been named where he is supposed to have lived and laboured.