—, of potash and soda, mixture of pure, xlix, 195.
Carbondale coal mine, xviii, 319.
[Carbonic acid of the atmosphere], from a memoir by Saussure, xvi, 214.
— —, amount of, in the atmosphere, xx, 183.
— —, of wells, means of removing, xxxviii, 206.
— —, on the removal of, from wells, O. P. Hubbard, xlii, 165.
— —, decomposition of, C. Despretz, xx, 186.
— —, —, by the light of the sun, J. W. Draper, xlvi, 398.
— —, disengaged by the roots of plants, xlv, 227.
— —, non-decomposition of, by plants, xxxiv, 44.