— —, of Pennsylvania and Delaware, xviii, 384.
— —, in Maryland, xxvii, 19.
Porosity of glass and siliceous bodies, vii, 192.
Porphyry of the Chinese frontier, xvii, 32.
— in Nova Scotia, xv, 203, 213.
— of Peru, xvii, 57.
Portable gas, xv, 189.
— — lamp, iii, 371.
Porter, A. L., edition of Gray's Operative Chemist, by, noticed, xix, 362.
Porter, J., floral calendar of Plainfield, Mass., 1818, i, 254.