Abstract
II. I HAVE hitherto spoken of and illustrated these phenomena in connection with green phosphorescence. It does not follow, however, that the phosphorescence is always of that colour. This coloration is a property of the particular kind of glass in use in my laboratory. I have here (Fig. 7) three bulbs composed of different glass: one is uranium glass (a), which phosphoresces of a dark green colour; another is English glass (b) which phosphoresces of a blue colour; and the third (c) is soft. German glass—of which most of the apparatus before you is made—which phosphoresces of a bright apple-green colour. It is therefore plain that this particular green phosphorescence is solely due to the glass which I am using. Were I to use English glass I should have to speak of blue phosphorescence, but I know of no glass Which is equal to the German in brilliancy.
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