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38 recently observed that the Auer burner can be advantageously replaced by the Nernst lamp, without a glass, this lamp giving more intense "N" rays. With a 200-watt lamp, the phenomena are marked enough to be, in my belief, easily visible to any one at the first trial.

In the course of my researches on "N" rays, I had occasion to note a very remarkable fact. The "N" rays were produced by an Auer burner enclosed in a lantern, and after passing through one of the sides of the lantern, formed by a sheet of aluminium, were concentrated by a quartz lens upon phosphorescent calcium sulphide. The Auer burner having