— and microlite, not identical, C. U. Shepard, xliii, 116; xlviii, 177.
—, analysis of, xlvi, 163.
Pyro-citric acid, new, vii, 187.
Pyro-gallic acid, J. Pelouze, xxviii, 126.
Pyrogenic acid, new, xxxiv, 206.
Pyroligneous acid, ii, 340; v, 188; ix, 201.
— —, purified by animal charcoal, xiii, 175.
— —, medical use of, ix, 201.
Pyrometer, steam, W. R. Johnson, xxii, 96.f