The Astrophysical journal . n times that of the quartz spectrograph; but in thiscase also the photograph failed to show any lines in the fluorescence was not intense enough to warrant the use of instru-ments of higher resolving power. It seems highly probable, how-ever, that the fluorescent spectrum of anthracene vapor is not resolv-able into lines like that of sodium vapor, but resembles, instead, thebanded spectra of fluorescent liquids and solutions. III. THE EFFECT OF INCLOSING A FOREIGN GAS WITH THE ANTHRA-CENE To determine what effect upon the fluorescence the presence ofano
The Astrophysical journal . n times that of the quartz spectrograph; but in thiscase also the photograph failed to show any lines in the fluorescence was not intense enough to warrant the use of instru-ments of higher resolving power. It seems highly probable, how-ever, that the fluorescent spectrum of anthracene vapor is not resolv-able into lines like that of sodium vapor, but resembles, instead, thebanded spectra of fluorescent liquids and solutions. III. THE EFFECT OF INCLOSING A FOREIGN GAS WITH THE ANTHRA-CENE To determine what effect upon the fluorescence the presence ofanother gas would have, the anthracene was inclosed in the bulb inturn with various gases at atmospheric pressure. It was found thatsome gases had practically no effect, while others extinguished thefluorescence more or less completely. The results are given in theaccompanying table. In the case of the gases listed in the first column of the table thequality of the fluorescence was unaffected by their introduction into PLATE X. Fluorescent and Absorption Spectra of Anthracene and Phenanthrene Vapors i. a, Fluorescence of Anthracene; b, Diffused Light: c, Cadmium Spark. 2. a, Xernst Filament; b, Absorption of Anthracene; c. Cadmium Spark. 3. a, Xernst Filament; 6, Absorption of Anthracene (dense vapor); c, Cadmium Spark. 4. a. Xernst Filament; b, Absorption, Commercial Anthracene; c, Cadmium Spark. 5. a, g, Cadmium Spark; h, Carbon Arc Spectrum; d, Solution A as screen; c. Solution B; e. Solution C; b, Crown- Glass Plate as screen. 6. a, Fluorescence of Phenanthrene; b, Cadmium Spark. ANTHRACENE AND PHENANTHRENE VAPOR SPECTRA 159Fluorescence of Anthracene Vapor Not Affected by Extinguished by Weakened by NitrogenHydrogenIlluminating gasCarbon monoxideCarbon dioxideMercury vapor CyanogenChlorineSulphur dioxideOxygen Air the bulb. A slight decrease in intensity, however, was observed,due, probably, to the higher pressures in the bulb after the gaseswere introduced (see §iv). So far
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