THE notice of the Proceedings of the National Academy of Science in NATURE, vol. xxi. p. 143, misrepresents, of course unintentionally, certain remarks of mine upon “dark” spectrum lines. I have not, ...
SOME time ago a correspondent of NATURE (vol. xiii. p. 287) inquired for an explanation of the fact that while common salt (chloride of sodium) colours the flame of an ordinary spirit-lamp yellow, the ...
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