Autograph Letter Signed, to John Forbes Royle, the surgeon and naturalist, at the Asiatic Society, explaining that he has to lecture at the hospital at the time fixed for the Society meeting, but hopes to call on Royle in a day or two. 2 pp. 7 x 4½ inches, in good condition, address leaf. 19 March 1836. Jonathan Pereira (1804-53), pharmacologist and physician, medical teacher and surgeon, published in 1823 Synopsis of the Chemical Decomposition that takes place in the Preparations of the London Pharmacopoeia. In 1824 he published his English translation of the newly revised Pharmacopoeia Londinensis and Selectae e praescriptis, a selection of medical prescriptions. There followed A Manual for the Use of [Medical] Students (1826) and A General Table of Atomic Numbers with an Introduction to Atomic Theory (1827). From 1842 Pereira devoted much of his time and energy to the completion of the third edition of The Elements of Materia Medica and Therapeutics, which was his major work.