| Show b 1 Light Emitted by Crystals The light flashed from crystals is ia lathe the tight light that has dawned upon the mind of Herr Of crystalline substances examined by him were found to emit light the alkaloids as asa asa asa a class being particularly active but only six out of in inorganic bodies showed the phenomenon The colors colora of the light varied with the different substances and its intensity could be classified according to an arbitrary scale in which uranium nitrate was taken as typical of the first class tartaric tartaric tar tar- acid of the second and ammonium um oxalate of the third The minute crystalline that may be formed by the ordinary white arsenic of commerce by dissolving it in boilIng boiling boil boil- Ing hydrochloric acid when cooled and shaken in the dark emit a succession succession succession sion of brilliant flashes The property is by no means fugitive and the dry crystals will yield sparks months afterward afterward af af- if rubbed with a a glass gl ss rod And contrary to text books the light Is emitted Just as readily from the crystals will yield sparks months affront af af- from front those of the vitreous tion This light has a continuous spectrum in the visible part of which the yellow and green rays predominate predominate predominate nate though red rays are also present It is apparently identical with the light emitted by solid bodies In a state of incandescence |
