The Elements of Materia Medica and Therapeutics. By Jonathan Pereira, M.D.F.R.S. & L.S. Fellow of the Royal College of Physicians in London: Vice-President of the Royal Medical and Chirurgical Society: Honorary Member of the Pharmaceutical Societies of Great Britain, St. Petersburg, and Portugal ; of the Medical and Physical Society of Erlangen ; and of the Natural History Association of Hesse: Corresponding Member of the Society of Pharmacy of Paris: Examiner in Materia Medica and Pharmacy to the University of London: and Assistant Physician To, and Lecturer on Materia Medica, At, the London Hospital