Lectures on the Materia Medica [electronic resource] : containing the natural history of drugs, their virtues and doses: also directions for the study of the Materia Medica; and an appendix on the method of prescribing. Published from the manuscript of the late Dr. Charles Alston, Professor of Botany and the Materia Medica in the University of Edinburgh, by John Hope, M.D. Professor of Medicine and Botany in that University. In two volumes