—, carmine, produced on ivory by red lead on the under side, xxvi, 74.
—, increase of, when objects are seen with the head inverted, D. Brewster, xl, 343.
—, inability to distinguish, xl, 54.
Coloring matter for dyeing, experiments on, M. Persoz, xxiv, 380.
— — of the Lichen rocella, xviii, 151.
— materials for confectioners, xxii, 381.
Columbic acid, A. A. Hayes, xlvi, 166.
[Columbite,] investigations on, Rose, xlix, 228.
— from New Hampshire, large crystal of, C. U. Shepard, xvii, 357.f
—, stanniferous, discovered in Massachusetts by C. U. Shepard, xvi, 220.f