Sluice-gates, [122]

Snow, how produced, [290]

Snow, crystals of, [64]

Snow a protection to plants, [309]

Solids, constitution of, [8]

Solids, attraction in, [39]

Solution, [12], [22]

Sound, what it is, [248]

Sound, sensation of, how produced, [252]

Sound, velocity of, [256]