TY - JOUR T1 - Researches into the Chemical Constitution of the Opium Bases. Part I.--On the Action of Hydrochloric Acid on Morphia JF - Proceedings of the Royal Society of London (1854-1905) VL - 17 SP - 455 EP - 460 PY - 1868/01/01/ UR - http://dx.doi.org/10.1098/rspl.1868.0094 M3 - doi:10.1098/rspl.1868.0094 AU - Matthiessen, A. ER -