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This paper contains the results derived from a study of the yellow, red, and infrared regions of the arc spectra of yttrium lanthanum, and cerium. Spectrograms were photographed with the dyes pinacyanol. kryptocyanin, and dicyanin. The rare earth compotmds studied were derived from two sources: From the University of Illinois were obtained the oxalates of yttrium and lanthanum and the oxide of cerium, prepared imder the direction of Prof. B. S. Hopkins; from Eimer and Amend were obtained the chlorides of yttrium and lanthanum and the nitrate of cerium, the last being a Kahlbaum preparation. In addition to spectrograms of the above-named materials secured with the concave grating spectrograph of the Btueau of Standards there were available for measurement two spectrograms made by Dr. Eder, of Vienna, with his grating spectrograph. These spectrograms were of yttrium and cerium salts prepared by C. Auer von Welsbach. The tables submitted herewith contain about 175 lines in the spectrum of yttrium, 410 in the spectrum of lanthanum, and about 1700 in that of cerium. Many of the wave lengths are those of heads of bands which are prominent in the spectra of yttrium and lanthanum. Part II of this paper, prepared by Prof. B. S. Hopkins and Dr. H. C. Kremers at the University of Illinois, describes the methods used in purifying the samples of yttrium, lanthanum, and cerium, which were used in this work.

Wave lengths longer than 5500 A in the arc spectra of yttrium, lanthanum, and cerium and the preparation of pure rare-earth elements