As to the variety and weakness of the rationale of this art, they are … — Essays
SAPIR 861
As to the variety and weakness of the rationale of this art, they are more manifest in it than in any other art; aperitive medicines are proper for a man subject to the stone, by reason that opening and dilating the passages they help forward the slimy matter whereof gravel and stone are engendered, and convey that downward which begins to harden and gather in the reins; aperitive things are dangerous for a man subject to the stone, by reason that, opening and dilating the passages, they help forward the matter proper to create the gravel toward the reins, which by their own propension being apt to seize it, 'tis not to be imagined but that a great deal of what has been conveyed thither must remain behind; moreover, if the medicine happen to meet with anything too large to be carried through all the narrow passages it must pass to be expelled, that obstruction, whatever it is, being stir
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