—, moss, mode of determination of age of, xxix, 349.
Peat-bogs, observations on, G. H. Adams, xxxviii, 127.
Peck, J., geology of the mining districts in Georgia, western North Carolina and East Tennessee, with a map, xxiii, 1.
Pecten, uses and economical notice of, xxxii, 248, 219.
Pectic acid, converted to oxalic, xvii, 179.
Peirce, B., elements of the third comet of 1845, xlix, 220.
Peligot, E., on tea, xlviii, 187.
Pelletier, on guaiac resin, xlix, 194.
Peloconite, new mineral species, xxii, 387; xxvi, 386.
Pelopium, new metal, xlviii, 400.