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In the ‘Proceedings’ of the Royal Society for 1877, April 26, there is a short paper by Mr. Huggins, in which some views of mine on this subject are called in question. Mr. Huggins’s objections are threefold:- 1. “There are not found in the spectra of different nebulae the differences of relative brightness of the bright lines and of the continuous spectrum which would be expected on Mr. Stone s hypothesis.

III. On a cause for the appearance of bright lines in the spectra of irresolvable star-clusters