Proportions, definite, in Chemistry, D. Olmsted, xii, 1.

Prospect Hill, East Haven, Ct., scenery of, vii, 3.

Proteus of the North American Lakes, S. L. Mitchill, iv, 181; vii, 68.f

—, D. H. Barnes, xi, 285.

Protococcus kermesinus, analogous to red particles in blood, xxxvi, 206.

Prout, W., analysis of starch sugar, xxxv, 299.

Providence Franklin Society, xviii, 195.

— tornado, R. Hare, xliii, 137.

— —, W. C. Redfield, xliii, 263.f

Prunnerite, new mineral species, xx, 197.