206 C.-E. A. WlNSLOW AND ANNE F. ROGERS 



phytes. Cells in plates or irregular masses (never in long chains 

 or packets). Generally decolorize by Gram. Growth on agar 

 abundant with formation of yellow pigment. Dextrose broth slightly 

 acid, lactose broth generally neutral. Gelatin frequently liquefied. 

 Nitrates may or may not be reduced. Includes M. orbicularis 

 Ravenel, M. luteus (Schroter) Cohn, and M. ochraceus Rosenthal. 



Genus 6, Sarcina (Goodsir): Exactly like Micrococcus, except 

 that division occurs under favorable conditions, in three planes, 

 producing regular packets. Includes S. ventriculi Goodsir, S. auran- 

 tiaca Fliigge, S. subflava Ravenel, S. tetragena (Mendoza) Mig. 



Genus 7, Rhodococcus, new genus: Saprophytes. Cells in groups 

 or regular packets. Generally decolorize by Gram. Growth on 

 agar abundant, with formation of red pigment. Dextrose broth 

 slightly acid, lactose broth neutral. Gelatin rarely liquefied. Ni- 

 trates generally reduced to nitrites, but not to ammonia. Includes 

 R. cinnabareus, Fliigge, R. roseus Fliigge, R. julvus Cohn, R. agilis 

 (Ali Cohen), R. rosaceus Lindner, and R. incarnatus Gruber. 



V. REFERENCES. 



ARONSON, H., 1903. Deutsche med. Wchnschr., 29, p. 439. 



BIGELOW, R. P., 1904. Wood's Reference Handbook of the Medical Sciences, 8, p. 182. 



BUERGER, L., 1904. Med. News, 85, p. 1117. 



CHESTER, F. D., 1901. A Manual of Determinative Bacteriology, New York. 



CHESTER, F. D., 1904. Fifteenth Annual Report of the Delaware College Agricul- 

 tural Experiment Station for 1903. 



CLARK, H. W., AND GAGE, S. D., 1905. Eng. News, 53, p. 27. 



COMMITTEE ON STANDARD METHODS OF WATER ANALYSIS, 1905. Jour. Infect. 

 Dis., Supplement No. i, p. i. 



CONN, H. W., 1900. Jour. Boston Soc. Med. Sciences, 4, p. 170. 



DUNHAM, E. K., 1903. Abstr., Science, N. S., 17, p. 372. 



ELLIS, D., 1902. Centralbl. f. Bakt., Abt. I, Orig., 33, p. i. 



FISCHER, H., 1904. Centralbl. f. Bakt., Abt. I, Orig., 37, p. 449. 



FLUGGE, 1896. Die Mikroorganismen, Leipzig. 



FULLER, G. W., AND JOHNSON, G. A., 1899. Jour. Exper. Med., 4, p. 609. 



GAGE, S. D., AND PHELPS, E. B., 1903. Rep. and Papers Amer. Public Health 

 Assoc., 28, 1902 meeting, p. 494. 



GALTON, F., 1889. (a) Proc. Roy. Soc., 45, p. 136; (b) Natural Inheritance, London. 



HOWE, F., 1904. Centralbl. f. Bakt., Abt. I, Orig. 36, p. 484. 



JORDAN, E. O., 1903. Jour. Hyg., 3, p. i. 



KENDALL, A. I., 1903. Rep. and Papers Amer. Public Health Assoc., 28, 1902 

 meeting, p. 481. 



KERNER, J., 1905. Centralbl. f. Bakt., Abt. I, Orig. 38, p, 223. 



