— —, theory of, E. S. Snell, xlix, 73.f
— heat, effect of, in raising a balloon, xxxiii, 196.
— and terrestrial radiation, observed at Montreal, xxxvi, 182.
— index, xlix, 301.f
— phosphori, xvii, 170.
— system, on the elements of, E. H. Burritt, xxvi, 129.
Soldering sheet iron, vii, 379.
Solfatara, connection of, with Vesuvius, xix, 387.
Solid bodies, instrument for measuring the expansion of, xxx, 324.f
Solidification of carbonic acid, xxxi, 163, 404; xxxv, 301, 346; xxxviii, 297f; xlii, 203; xlix, 206.f