In 1826 he became lecturer on chemistry at the Royal College of Surgeons .
In 1832 he was an established physician in London , being appointed professor of materia medica and lecturer in chemistry at the Aldersgate Medical School .
In 1826 he became lecturer on chemistry at the Royal College of Surgeons and in 1832 he was an established physician in London , being appointed professor of materia medica and lecturer in chemistry at the Aldersgate Medical School .