Druckrey, H., Ivankovid, S., and Preussmann, R. (1966). Nature (Lond. , 210, 1378. Preussmann, R., Ivankovid, S., Schmidt, C. H., Mennel, H. D., and Stahl, K. W. (1964). Z. Krebsforsch., 66, 280. Steinhoff, D., Preussmann, R., and Ivankovie, S. (1964). Ibid., 66, 1. Dunning, W. F., Curtis, M. R., and Maun, M. E. (1950). Cancer Res., 10. 454. Goldblatt, M. W. (1949). Brit. 7. industr. Med., 6, 65. Henry, S. A. (1928-9). 7. Hyg. (Lond.), 28, 100. (1946). Cancer gf the Scrotum in Relation to Occupation. London. Hueper, W. C., and Wolfe, H. D. (1937). Amer. 7. Path., 13, 656. Hutchinson, J. (1887). Lancet, 2, 1166. Irving, C. C. (1962). Cancer Res., 22, 867. kull, J. W. (1951). Brit. 7. Cancer, 5, 328. Kurland, L. T. (1964). Fed. Proc., 23, 1337. Laqueur, G. L. (1965). Virchows Arch. path. Anat., 340, 151. and Matsumoto, H. (1966). 7. nat. Cancer Inst., 37, 217. Mickelsen, O., Whiting, M. G., and Kurland, L. T. (1963). Ibid., 31, 919. Leitch, A. (1929). A.R. Brit. Emp. Cancer Campgn, 6, 32. Magee, P. N. (1964). In Cellular Control Mechanisms and Cancer, edited by P. Emmelot and 0. Muhlbock. Amsterdam. and Barnes, J. M. (1962). 7. Path. Bact., 84, 19. Oett1,, A. G. (1966). Proceedings of 6th Canadian Cancer Conference, edited by R. W. Begg, p. 224. London. Pott, P. (1775). Chirurgical observations relative to the catarac:, polypus of the nose, the cancer of the scrotum, the different kinds of ruptures and the mortification of the toes and feet. London. Price, J. M. (1966). Proceedings of 6th Canadian Cancer Conference, p. 224. -London. Rees, K. R. (1966). Gut, 7, 205. Rehn, L. (1895). Arch. klin. Chir., 1, 588. Schoental, R., and Magee, P. N. (1962). Brit. 7. Cancer, 16, 92. Scott, W. W., and Boyd, H. L. (1953). 7. Urol. (Baltimore), 70, 914. Statistics of Compensation and Proceedings under the Workmen's Compensation Acts and the Employers' Liability Act, 1880. Published annually by H.M. Stationery Office. Volkmann, R. (1874). Beitr. Chir. (Lpz.), p. 370. Wallace, D. M. (1959). Tumours of the Bladder, Vol. 2 of Monographs on Neoplastic Disease at Various Sites. Edinburgh. Whiting, M. G. (1964). Fed. Proc., 23, 1343. Spatz, M., and Matsumoto, H. (1966). Economic Botany, 20, 98. Willis, R. A. (1958). The Borderland of Embryology and Pathology. London. (1960). Pathology of Tumours, 3rd ed. London. Yamagiwa, K., and Ichikawa, K. (1918). 7. Cancer Res., 3, 1. Yoshida, von T. (1932). Proc. imp. Acad. Japan, 8, 464.