1. Lines of Solar Spectrum. 2. Colours of Solar Spectrum.
3. Spectrum of Sodium. 4. Spectrum of Lithium.
IX.
THE CHEMISTRY OF THE SUN.
Reference has already been made to the results of spectrum observations by Professors Kirchhoff and Bunsen of Heidelberg. The method of research is, however, so important as to demand a separate notice. A new era, both in chemistry and astronomy, has been inaugurated by the discovery of this method. Sufficient time has not yet elapsed for the accumulation
