824 RADIATION BIOLOGY 



Wilbur, K. M., and R. O. Recknagel (1943) The radiosensitivity of eggs of Arbacia 



punctulata in various salt solutions. Biol. Bull., 85: 193-200. 

 Wilson, C. W., A. F. Hughes, A. Gliicksmann, and F. G. Spear (1935) Bestrahlungs- 



versuche an Huhnerembryonen in vitro und in vivo mit Radiumgammastrahlen. 



Strahlentherapie, 52: 519-524. 

 Wright, G. P. (1925) The relative duration of the various phases of mitosis in chick 



fibroblasts cultivated in vitro. J. Roy. Microscop. Soc, 45: 414-417. 

 Yamashita, H., K. Mori, and M. Miwa (1939) The action of ionizing rays on sea 



urchin. II. The effects of roentgen, gamma, and beta rays upon the fertilized 



eggs. Gann, 33:117-121. 

 Zirkle, R. E. (1936) Modification of radiosensitivity by means of readily penetrating 



acids and bases. Am. J. Roentgenol. Radium Therapy, 35: 230-237. 

 , P. C. Aebersold, and E. R. Dempster (1937) The relative effectiveness of 



fast neutrons and X-rays upon different organisms. Am. J. Cancer, 29: 556 562. 



Manuscript received by the editor Nov. 23, 1951 



