ἀσκεῖν περὶ τὰ νοσήματα δύο, ὠφελεῖν ἢ μὴ βλάπτειν → strive, with regard to diseases, for two things — to do good, or to do no harm | as to diseases, make a habit of two things — to help, or at least, to do no harm
cestros: i, f., = κέστρος>,
I the plant betony: Betonica officinalis, Linn.; Plin. 25, 8, 46, § 84.