—, sulphurous acid, reaction of the essential oils with, xxxi, 281.
—, syphons, improved, xxiv, 317.f
—, valve cock, xxiv, 251.f
—, volumescope, description of, xv, 275f; xxviii, 264.f
—, —, application of, xv, 278.f
—, volumeter, xii, 38.f
—, water, apparatus for decomposition and recomposition of, xxxviii, 336.f
—, Woulfe's apparatus, a substitute for, i, 410f; xiii, 1.f
Harlan, R., Arvicola ferrugineus, x, 285.
—, Batracian reptiles, new, with observations on the larvæ of frogs, x, 53.