Slide of Alpnach, xxiv, 124.
— in Essex Mountains, W. C. Redfield, xxxiii, 313.
— from Mount Pilatus to the Lake of Lucerne, iii, 368.
— and avalanches in the White and Green Mountains, xv, 217.
Small pox, nature of the virus of, xix, 389.
— —, F. Pascalis's theory of its origin, x, 208.
— —, on the increase, xxxviii, 134.
— —, power of new virus, xxxviii, 134.
Smilax grandifolia, xlv, 171.
Smith, Al., Connecticut valley, water courses and geology of, xxii, 205.f