Specific gravity of solids, how ascertained, [142]
Specific gravity of liquids, how ascertained, [144]
Spectrum, [360]
Spider, web of, [19]
Spirit distinguished from matter, [1]
Spirit, origin of word, [4]
Spirit-level, [114]
Springs, [120]
Stability of bodies, [103-105]
Steam transparent and invisible, [293]