—, English, viii, 389; x, 194.
—, paramorphine in, xxiv, 374.
—, thebaine in, xxx, 379.
Opossum, remains in the Stonesfield slate, xxvii, 412; xxxvii, 228.
Optics, notice of D. Brewster's Treatise on, xxiv, 389.
Optical amusements, xvi, 398.
— experiment, exhibiting the blood vessels of the eye, xxi, 166.
— deception, instrument for exhibiting a certain, E. S. Snell, xxvii, 310.
— instruments, xix, 390.
— properties of saccharine juice, Biot, xxiv, 379.