Spectrum, solar, see [Solar.]
Specula for telescopes, improvement in, xliv, 166.
Speculum, Nasmyth's pneumatic, xxxviii, 107.
Spencer, A., vindication of claims, relating to the graphic art, xliv, Appendix.
Spencer, T., on the electrotype and its use, xl, 157.f
Spermaceti, composition of, products of distillation of, and oxidation of, by nitric acid, J. Lawrence Smith, xliii, 301.
—, moving particles in, when burning, xl, 148.
Sphene in Canada, viii, 76.
— in Massachusetts, vii, 53, 254; xxiv, 397.
— in New Jersey, v, 243, 244.