47. Krafft & Lyons, Ber., 27, 1762 (1894); A. Ch., (6), 20, 228. 48. K. A. Hoffmann, Ber., 27, 2809 (1894). 49. M. Busch, Ber., 25, 2853, (1892). 50. Lellmann & Stickel, Ber., 19, 1605 (1886). 51. B. Rathke, Ann., 152, 201 (1869). 52. Gabriel & Stelzner, Ber., 29, 1313 (1896). 53. Bogert, Breneman, & Hand, J. Am. Chem. Soc., 25, 373 (1903). 54. Am. Chem. Abs., 3, 870 (1903); Bull. Belg. Soc. Chem., 23, 9-11. 55. Bogert & Hand, J. Am. Chem. Soc., 24, 1035, (1902). 56. Becker & Meyer, Ber. 37, 2551 (1914). 57. H. Bauer, Ber. 48, 507 (1915); Lyons & Shinn, J. Am. Chem. Soc. 1902: 1092; Fritz von Konek & O. Schleifer, Ber. 51, 850 (1918); A. Michaelis, Ber. 30, 2827 (1897); Ber. 48, 873 (1915); H. Frerichs, Arch. Pharm. 1902: 240, 656. 58. Fromm & Martin, Ann., 401, 178 (1913). VITA Yü-Gwan Chen was born in Nanking, China, March 8, 1893. After graduation from college in 1915, he further studied Chinese classics, 1915-16. He entered Case School of Applied Science, Cleveland, Ohio, as a special student in the Department of Chemistry, 1916-17. He registered at Columbia University to pursue graduate work in chemistry under the Faculty of Pure Science; and was awarded the degree of Master of Arts in 1918. From September 1919 to June 1922, he has been pursuing research in organic chemistry in the research laboratories of Havemeyer Hall, Columbia University. FOOTNOTES: [A] Not a new compound but prepared by a different method. [B] Note--dimethyl selenophene, however, is colorless. Transcriber's notes: The diagram of 3-(p-phenylarsonic)-aminoselenazine, labelled (II), has been adjusted to make its structure clearer. The "l" in "2HCl" in the first equation under "Preparation of 2-methyl-4-selenoquinazolone" was missing in the original. The following is a list of changes made to the original. The first line is the original line, the second the corrected one. selnoquinazolone prepared in the course of this research selenoquinazolone prepared in the course of this research on four different strains of mouse carcenoma and one strain on four different strains of mouse carcinoma and one strain in consequence of its smell I so completely loss my sense of smell in consequence of its smell I so completely lost my sense of smell of the phenazine, oxasine, thiazine, acridine series show of the phenazine, oxazine, thiazine, acridine series show and Se again most powerful of the whole series. and :Se again most powerful of the whole series. simplicity, is that of Babriel and Stelzner(52), simplicity, is that of Gabriel and Stelzner(52), on cooling was filtered out and recrystalized from dilute alcohol. on cooling was filtered out and recrystallized from dilute alcohol. It was prepared from Sodium hydroxide in absolute alcohol It was prepared from sodium hydroxide in absolute alcohol