PHYSICAL AND BIOLOGICAL FACTORS 951 



Gray, L. H. (1946) Comparative studies of the biological effects of X rays, neutrons 



and other ionizing radiations. Brit. Med. Bull., 4: 11-18. 

 and J. Read (1948) Comparison of the lethal effect of neutrons and gamma 



rays on mouse tumours (a) By irradiation of grafted tumours in vivo (b) By 



irradiation of tumour fragments in vitro. Brit. J. Radiology, 21 : 5-10. 

 Hagen, C. W., Jr., and G. Sacher (1946) Effects of X rays on rabbits. I. Mortality 



after single and paired doses. USAEC Report MDDC-1252.* 

 and E. L. Simmons (1947) Effects of total body X-irradiation on rats. 



I. Lethal action of single, paired, and periodic doses. USAEC Report MDDC- 



1210.* 

 Haley, T. J., S. Mann, and A. H. Dowdy (1950) A comparison of the response of 



normal and hypothyroid mice to acute whole body roentgen radiation. Science, 



112: 333-334. 

 Hall, B. V. (1951) Changes in the radiosensitivity of tumor fragments induced by 



pre-treatment in vitro with cysteine, methylene blue, and sodium cyanide. 



Cancer Research, 11: 254. 

 Hayden, B., and L. Smith (1949) The relation of atmosphere to biological effects of 



X-rays. Genetics, 34: 26-41. 

 Hektoen, L. (1918) Further studies on the effects of the roentgen ray on antibody- 

 production. J. Infectious Diseases, 22: 28-33. 

 Hempelmann, L. H., T. T. Trujillo, and N. P. Knowlton, Jr. (1949) The effect of 



lethal doses of X-rays on chilled and thyroidectomized animals. USAEC 



Reports, Nucl. Sci. Abst., 3: 46; AECU-239.* 

 Hennessy, T. G., and F. B. Folsom (1950) The inability of cysteine to protect ery- 

 thropoietic bone marrow against irradiation injury at a dose level of 800 r. Nav. 



Radiol. Def. Lab. Report AD-266(B).* 

 , , and J. K. Glover (1950) The inability of glutathione to protect 



erythropoietic bone marrow against irradiation injury at a dose level of 300 r. 



Nav. Radiol. Def. Lab. Report AD-267(B).* 

 and R. L. Huff (1950) Depression of tracer ion uptake curve in rat erythro- 



cytes following total body X-irradiation. Proc. Soc. Exptl. Biol. Med., 73: 



436-439. 

 Henry, J. A. (1949) Total X-irradiation of rats under urethane anesthesia. Nature, 



163: 134-135. 

 Henshaw, P. S. (1938) The action of X-rays on nucleated and non-nucleated egg 



fragments. Am. J. Cancer, 33: 258-264. 

 (1944) Experimental roentgenological injury. III. Tissue and cellular 



changes brought about with single massive doses of radiation. J. Natl. Cancer 



Inst., 4: 503-512. 

 and D. S. Francis (1935) A consideration of the biological factors influencing 



the radiosensitivity of cells. J. Cellular Comp. Physiol., 7: 173-195. 

 , E. F. Riley, and G. E. Stapleton (1947) The biologic effects of pile radia- 

 tions. Radiology, 49: 349-360. 

 and R. S. Snider (1946) Correlation of tissue responses following exposure to 



penetrating radiations. USAEC Report MDDC-569.* 



E. F. Riley, G. E. Stapleton, and R. E. Zirkle (1946) Comparative 



late effects of single doses of fission neutrons and of gamma rays. USAEC 

 Report MDDC-1254.* 



Herve, A., Z. M. Bacq, and H. Betz (1950) Chemical modification of the lethal 

 effect of X-radiation and the mechanism of action. Sixth Intern. Congr. Radi- 

 ology, London, abstracts of papers, p. 169. 



Hevesy, G. (1945) Effect of roentgen rays on cellular division. Revs. Mod. 

 Phys., 17: 102-111. 



