822 RADIATION BIOLOGY 



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Nebel, B. R., E. B. Harvey, and A. Hollaender (1937) The cytology of Arbacia 

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(1918) The effect of radium radiations on the development of Chaetopterus. 



Biol. Bull., 35: 50-70. 



(1931) The biological effects of short radiations. Quart. Rev. Biol., 6: 



253-280. 

 Paterson, Edith, and M. Thompson (1949) Effect of urethane combined with X-rays 



on chick fibroblasts. Nature, 163: 563. 

 Pekarek, J. (1927) Ueber den Einfluss der Roentgenstrahlen auf die Kern- and 



Zellteilung von Vicia faba. Planta, 4: 299-357. 

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auf tierisches Gewebe. Z. Zellen-Gewebelehre, 1: 413-444. 

 Rajewsky, B., and M. Schon (1948) Naturforschung und Medizin in Deutschland. 



Dieterich'sche Verlagsbuchhandlung, Wiesbaden, 21. 

 Regaud, C, A. Lacassagne, and J. Jovin (1925) Lesions microscopiques determinees 



par les rayons X dans l'embryon de poulet. Compt. rend. soc. biol., 93: 1587- 



1589. 

 Richards, A. (1915) The effect of X-rays on the rate of cell division in the early 



cleavage of Planorbis. Biol. Bull., 27: 67-96. 

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of Cumingia eggs. Biol. Bull., 37: 209-221. 

 Hugh, R. (1949) Histological effects on the embryo following X-irradiation. J. 



Morphol., 85: 483-502. 

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on meiotic chromosomes. J. Cellular Comp. Physiol., 36: 185-194. 

 Sax, K., and C. P. Swanson (1941) Differential sensitivity of cells to X-rays. Am. J. 



Botany, 28: 52-59. 

 Soide, J. (1925) Zur Kenntnis der biologischen Strahlenwirkung. Untersuchungen 



am Ascaris-Ei mit ultravioletten, Rontgen und Radiumstrahlen. Z. Wissensch. 



Zool., 124: 252-304. 

 Simon-Reuss, J., and F. G. Spear (1947) The effect of gamma radiation on mitosis 



in vitro. Brit. J. Radiology, 20: 63-70. 

 Sparrow, A. H. (1946) Reduced chromonema elongation and abnormal spiralization 



following X-ray treatment of meiotic chromosomes. Genetics, 30: 23. 



— and F. M. Rosenfeld (1946) X-ray-induced depolymerization of thymo- 



nucleohistone and of sodium thymonucleate. Science, 104: 245-246. 

 Spear, F. G. (1931) Immediate and delayed effects of radium (gamma rays) on 



tissue cultures in vitro. Brit. J. Radiology, 4: 146-165. 



