The investigations of Lord Rayleigh and Sir William Ramsay had shown that indifference to chemical reagents did not sufficiently characterize an unknown gas as nitrogen, and it became necessary to reinvestigate other cases of the occurrence of "nitrogen" in nature.
Ramsay, repeating these experiments, found that the inert gas emitted refused xIIl.
The density of helium has been determined by Ramsay and Travers as 1.98.
- A bibliography and summary of the earlier work on helium will be found in a paper by Ramsay, Ann.
Alexander Robert Maule Ramsay, third son of the 13th Earl of Dalhousie.
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