— of the Mississippi, iii, 247.
— of the Missouri and Mississippi rivers, due to pseudo-volcanoes, J. N. Nicollet, xlv, 154.
Pump, by steam, xvi, 181.
—, air, see [Air pump.]
Purple of Cassius, ii, 350; xx, 192; xxviii, 145; xlviii, 192.
Pursh, F., notice of the herbarium of, xl, 11.
—, botanical excursions of, xlii, 10.
—, notice of, ix, 269.
Putnam's rock, v, 37.
Putnam Hill, section of, xxix, 30.f