posology

The difficulty here alluded to occurs in the doses of medicine exhibited by the ancient physicians. These have long been observed to be very large; and it was on remarking the impossibility, according to our ideas, of exhibiting them with safety to human life, or even of escaping destruction under their influence, that my observation was first drawn to the subject of ancient posology.

https://books.google.com/books?id=SjEmyxU8L8oC&pg=PA253 page 253 [T]he branch of art and science therein denominated Posology, but commonly called Mathematics. […] https://books.google.com/books?id=SjEmyxU8L8oC&pg=PA254 page 254 Of the two minor aggregates, into which, by this means, the major aggregate, Posology or Mathematics, was divided,—form-regarding, or figure-regarding Posology or Mathematics, in Greek-sprung language, Morphoscopic Posology, was the name given to the positive minor aggregate: […]