DOLJANSKI, L. AND G. GOLDHABER. 1942. Radiobiological studies in tissue culture. I. The immediate effects of X-ray on cell out-growth in cultures of fibroblast. Growth 6: 235-249. J. TRILLAT, P. LEcoMTE Du NOUEJ, AND A. ROGOZINSKI. 1931. L'action des rayous x sur la culture de tissue in vitro. Compt. Rend. l'Acad. Sci., Paris 192: 304-305. EPHRUSsI, B. 1933. Croissance et regeneration dans les cultures des tissues. Arch. Anat. Microsc. 29: 95-159. GOLDFEDER, A. 1938. Studies on the effect of radiation upon growth and respiration of various tissues in vitro. Radiology 31: 73-80. 1940. Further studies on the effects of irradiation in proliferation and metabolic processes of normal and malignant tissues. IV. Effects produced by different dosage rates of x-radiation in the proliferation of various tissues grown in vitro. Radiology 35:210-228. GRAY, L. H., MoTrRAM, J. R., AND F. G. SPEAR. 1940. Some experiments upon the biological effects of fast neutrons. Brit. Jour. Radiol. 13:371-399. , AND J. READ. 1944. The effect of ionizing radiation on the broad bean root. IV. Summation of the effects of radiation of different ion density. Brit. Jour. Radiol. 17:265-271. HABERSTAEDTER, W., G. GOLDHABER, AND L. DOLJANSKI. 1942. Comparative studies on the radio-sensitivity of normal and malignant cells in cultures. I. The effect of X-rays on cell out-growth in cultures of normal rat fibroblasts and rat benzpyrene sarcoma. Can. Res. 2:28-31. HAPWOoD, F. W., AND M. A. DONALDSON. 1930. A remarkable sequel to an attempt to determine the X-ray lethal dose for tissue cultures growing in vitro. Brit. Jour. Radiol. N.S. 3: 69. KERsTEN, H., AND C. H. DWIGHT. 1937. The viscosity sols made from X-radiated agar. Jour. Phys. Chem. 41: 687-689. KREBS, R. P., AND H. J. KERSTEN. 1942. Portable indicating X-ray dosimeter. Rev. Sci. Instr. 13: 332-334. SKOOG, F. 1935. The effect of X-irradiation in auxin and plant growth. Jour. Cell. Comp. Physiol. 7: 227-270. . 1944. Growth and organ formation in tobacco tissue cultures. Amer. Jour. Bot. 31: 19-24. SMITH, GLADYS F., AND H. J. KERSTEN. 1941. Root modifications induced in Vicia faba by irradiating dry seeds with soft X-rays. Plant Physiol. 16:145159. -AND . 1942a. The relation between xylem thickenings in primary roots of Vicia faba seedlings and elongation, as shown by soft X-radiation. Bull. Torrey Bot. Club 69:221-234. , AND . 1942b. Auxin and caulines in seedlings from X-rayed seeds. Amer. Jour. Bot. 29: 785-791. WADDINGTON, C. H. 1942. Some effects of X-rays on Drosophila. Jour. Exp. Biol. 19: 101-117. WHITE, P. R. 1939a. Potentially unlimited growth of excised plant callus in artificial nutrient. Amer. Jour. Bot. 26:59-64. 1939b. Controlled differentiation in plant tissue culture. Bull. Torrey Bot. Club 66:507-513.