BOERHAAVE, Hermann (1668-1735). Autograph letter signed, in French, to Dr Magra, in Rotterdam, Leiden, 9 August 1735, discussing a patient and writing out a remedy which he suggests using to treat their intestinal disorder, 2 pages, 4to, with integral address leaf, traces of seal, later annotations to address leaf (losses from seal tears restored, a few small holes to address panel). Provenance: Fillon collection, no.790.