He was examiner on the subject in the University of London .
Jonathan Pereira FRS ( 22 May 1804 , London -- 20 January 1853 ) was a pharmacologist , author of the Elements of Materia Medica , a standard work .
Jonathan Pereira FRS was pharmacologist on the subject in the University of London .
Jonathan Pereira FRS ( 22 May 1804 , London -- 20 January 1853 ) was a pharmacologist , author of the Elements of Materia Medica , a standard work .