In a letter to John Mapletoft he refers to a class of detractors "qui vitio statim vertunt si quis novi aliquid, ab illis non prius dictum vel etiam inauditum, in medium proferat" ("Who by a technicality suddenly turn if something is new, if someone should disclose something not previously said or heard"); and in a letter to Robert Boyle, written the year before his death (and the only authentic specimen of his English composition that remains), he says, "I have the happiness of curing my patients, at least of having it said concerning me that few miscarry under me; but [I] cannot brag of my correspondency with some other of my faculty ...