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The ultraviolet absorption of all of the compounds was measured with a Hilger "Spekker" Photometer in conjunction with a Hilger E316 spectrograph. The source was a tungsten steel spark in some cases and a wide aperr ture hydrogen discharge tube in others. Either source was satisfactory. The Spekker photometer gave much more satisfactory results than the rotating sector used for earlier work.8 Eastman d. c. Ortho and Cramer Contrast plates were both used with success. Solutions were in distilled water unless otherwise indicated.We wish to express our gratitude to Mr. D. F. Hayman and Mr. S. Adler for the micro-analyses, to Dr. Joseph K. Cline for the preparation of 2-methyl-6-oxy-and 2-methyl-6-aminopyrimidines, to Mr. R. E. Waterman for the pVL determinations and to Dr. . T. Clarke for the use of facilities in preparing some of the spectrograms. (9) Wintersteiner, Williams and Ruehle, This Journal, 57, Ó17 (1935). Summary 1. Methods of preparation are given for all of the previously unknown mono-and di-C-methyl derivatives of 0-oxy and 6-aminopyrimidine.2. The ultraviolet absorption is given of both complete series including the non-alkylated members.3. Addition of acid modifies the absorption of the 6-amino pyrimidines by reducing the prominence of the longer wave length band; alkali tends to equalize the prominence of the two bands.4. The absorption of aminosulfonic acid from the vitamin reveals the influence of the acidity of the sulfonic group and is affected by alkali in a similar manner as non-sulfonated 6-aminopyrimidines.