1. W. J. P. Neish, Exper.14, 287 (1958).
2. E. Farber, Proc. Amer. Ass. Cancer Res.2, 15 (1955); Cancer Res.16, 142 (1956).
3. B. Korpássy andM. Mosonyi, Brit. J. Cancer4, 411 (1950).
4. J. L. Hartwell,Survey of compounds which have been tested for carcinogenic activity, Suppl. I, p. 29 (1957), U.S. Public Health Service.
5. K. Peters, W. Krais, andH. Dorn, Arch. exp. Path. Pharmak.229, 182 (1956).