Snell, E. S., instrument for exhibiting a certain optical deception, xxvii, 310.
—, facts relative to the temperature of the year 1839, from observations at Amherst College, xxxix, 36.f
—, a singular case of parhelion, and the theory of halos, xlix, 73.f
—, on some new articles of philosophical apparatus, xlix, 20.f
Snow, animalcules in, xviii, 56.
—, balls of, at Brunswick, Me., vi, 162.
—, clearing of, from the Baltimore railway, xx, 166.f
—, crystallization of, J. Green, ii, 337.f
—, —, C. Dewey, iii, 367.
—, cylinders of, ii, 375.