The Origin of Optical Spectra

Abstract

AMONG the many remarkable communications made this year to Section A (Mathematics and Physics) of the British Association, which, grouped together, will probably mark it off as an outstanding meeting, the address by the sectional president, Prof. McLennan, on the origin of spectra, was not the least interesting. From among the many subjects he surveyed it may be of interest to select some, and to try to give a not too technical account of these, showing the sort of progress that is now being made under the stimulus of Prof. Bohr's theory.