Potosi silver mines, xxiv, 233.
Potstone, Middlefield, Mass., viii, 51.
— of Greenland, xvii, 14.
Potter, C. E., notice of a rocking stone, xxiv, 185.f
Pottery, analysis of, xv, 183.
—, notice of A. Brongniart on, xxxi, 134.
—, ancient American, xxvii, 175.
Powder of Cassius, purple, see [Cassius.]
— of Balda, viii, 204.
— mills, inflamed by the stroke of copper, xiii, 161.