— from the graphite mine of Pfaffenreith, one-third water, xv, 390.
Opelousas, geological notice of xxxv, 344.
Ophisaurus ventralis, i, 262.
Opiamon, xlix, 205.
Opianic acid, xlvii, 196; xlix, 205.
Opiano-sulphurous acid, xlix, 205.
Opium, constitution of, xxviii, 359.
—, mode of detecting minute quantities of, R. Hare, xii, 290.
—, observations and experiments on, G. W. Carpenter, xiii, 17.