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The Method of preparing consists in these four things; Calcination, Solution, Filtration, and Coagulation; first the Medical matter must be reduced into ashes by Calcination, but care must be taken that the ashes be not turned into glass by too great a fire, then by pouring clear hot wa∣ter upon the ashes to extract all the Salts, make a Lie; filtrate and boil it in an earthen vessel o∣ver a gentle fire, till all the water is evaporated,
and only Salt remains, which must be dissolved, filtered, and coagulated once and again, till it is free from all its impurities, and becomes white, and so are made Salts from Plants, parts of A∣nimals calcined, and the like; of these the fol∣lowing are best; Salts of Wormwood, Thyme, Rosmary, the lesser Centaury, Mugwort, Cardu∣us Benedictus, Masterwort, Parsly, Rest-harrow, Ash, Dwarf Elder, Gujacum, Box, Cammomile, St. John's-wort, Succory, Celandine, Scurvy-grass, Betto∣ny, Hemp Agrimony, Baulm, Ceterach, and the like.