Relation of Emission to Absorption
The Lines of Fraunhofer
Their Explanation by Kirchhoff
Solar Chemistry involved in this Explanation
Foucault's Experiment
Principles of Absorption
Analogy of Sound and Light
Experimental Demonstration of this Analogy
Recent Applications of the Spectroscope
Summary and Conclusion


APPENDIX.

On the Spectra of Polarized Light

Measurement of the Waves of Light

INDEX




ON LIGHT




LECTURE I.