— —, improvement in, xxviii, 148.

— —, mode of separating from old letters, xxiii, 200.

[Seawater] near Brighton, analysis of, G. Schweitzer, xxxviii, 12.

—, Black Sea, analysis of, xx, 188.

—, quantity of salt in, C. Daubeny, xxxvi, 188.

—, potash in, iii, 371.

—, absorption of light by, v, 134.

—, marine animals in, v, 134.

—, color of, vi, 198; xxix, 237.

—, cause of color of, xxvi, 65.f