62. GOLDSTEIN’S EXPERIMENT. PHOSPHORESCENCE OF PARTICULAR CHEMICALS BY CATHODE RAYS. _Nature_, Lon. Feb. 21, ’95, p. 406. _Weid. Ann._, No. II, ’95.—Lithium chloride when acted upon by cathode rays, phosphoresced to a dark violet color or heliotrope, which it retained for some time in a sealed tube. Chlorides generally and other haloid salts of potassium and sodium showed similar effects. The colors were superficial and could be driven away rapidly either by heating or the action of moisture. 63. KIRN’S EXPERIMENT. SPECTRUM OF POST PHOSPHORESCENCE OF DISCHARGE TUBES. _Wied. Ann._, May, ’94. _Nature_, Lon. June 7, ’94, p. 131.—Carl Kirn compared the spectra of the phosphorescence of a vacuum bulb, during and immediately after the discharge. The details are as follows: The spectrum of the after-glow, § 54, at end and 22, was found to be continuous. In this connection, see a plate showing different kinds of spectra, for example, _Ganot’s Physics_, frontispiece. The spectrum shortened from both directions to a band between the wave lengths of 555 and 495µµ. The spectrum then continued to grow shorter and shorter until it disappeared at the line E, which is the position of the greatest luminosity of the solar spectrum. For experiments on spectrum, see Fraunhofer in _Gilbert’s Ann._, LVI. During the discharge, the spectroscope showed a line spectrum corresponding very closely to those of carbonic acid gas and nitrogen. Some authorities had suggested that perhaps the after phosphorescence and the beginning of the incandescence of a solid body, were the same kind of light, but this experiment shows that such is not the case, unless some relation exists on the ground that the two phenomena are exactly opposite to each other, and it confirms similar results obtained by Morrin and Riess. The result indicates that the nature of the phenomenon is not identical in all respects with light produced at a high temperature.