Perkins, H. C., notices of fossil bones from Oregon, xlii, 136.f
Perkins, J., compressibility of water, iii, 347.f
—, engraving on steel, iii, 353.
—, new steam engine, vii, 111.f
—, mode of applying his method of generating steam to the boilers of ordinary steam engines, vii, 116, 332.f
—, on steam engines, xiii, 40.
—, on the cutting of steel by soft iron, vii, 390.
Perkins, T., salting of ship timber, ii, 117.
Perkins's Algebra, noticed, xliii, 380.
Peron, on the temperature of the ocean, xvii, 295.