PROTOZOA AND INVERTEBRATE EGGS 329 



Miwa, M., H. Yainashita, and K. Mori (1939a) The action of ionizinK rays on sea 

 urchin. I. The effects of roentgen, gamma, and beta rays upon the unfertilized 

 eggs and sperms. Gann, 33: 1-12. 



(1939b) The action of ionizing rays on sea urchin. IV. The effects of alpha 



rays upon fertilized eggs. Gann, 33: 323-330. 



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

 urchin. III. Further observations on recovery phenomenon in the effects of 

 beta rays upon unfertilized eggs and sperm with some studies on the time factor 

 problems. Gann, 33: 316-321. 



Mottram, J. C. (1941) Abnormal paramecia produced by blastogenic agents and 

 their bearing on the cancer problem. Cancer Research, 1: 313-323. 



(1942) The problem of tumours. H. K. Lewis and Co., Ltd., London. 



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



punctulata activated by monochromatic ultraviolet radiation. Biol. Bull., 73: 

 365-366. 

 Packard, C. (1924) The susceptibility of cells to radium radiations. Biol. Bull., 46: 



165-177. 

 Patel, C. (1936) Ueber die physikalische und chemische Beeinfiussbarkeit von 



Trypanosomen in Hiiiblick auf das Vorkommen abgeschwachter Erregerstamme. 



Z. ImmunitJitsforsch., 89: 325-361. 

 Phelps, A. (1946) Photosensitivity of the ciliate Tetrahymena geleii. Anat. Record, 



96: 513. 

 (1949) Effect of visible light on growth of Tetrahymena geleii. Anat. Record, 



105: 500-501. 



Piffault, C. (1939) Actions des rayons X sur I'eau et ses consequences. Compt. 

 rend. soc. biol., 130: 43-44. 



Powers, E. L. (1948) Death after autogamy in Paramecium aurelia following expo- 

 sure in solution to the radioactive isotopes P^^ and Sr*'*", Y"". Genetics, 33: 

 120-121. 



Powers, E. L., and C. Raper (1950) Response induced by a nitrogen mustard com- 

 pound in Paramecium aurelia. Genetics 35: 131. 



Powers, E. L., and D. Shefner (1948) Lethal changes induced by X rays in Para- 

 mecium aurelia. Genetics, 33: 624-625. 



(1950) Effects of high dosages of X rays in Paramecium aurelia. Genetics, 



35: 131. 



Preer, J. R. (1948) The killer cytoplasmic factor kappa, its rate of reproduction, the 

 number of particles per cell, and its size. Am. Naturalist, 82: 35-42. 



(1950) Microscopically visible bodies in the cytoplasm of the "killer" 



strains of Paramecium aurelia. Genetics, 35: 344-362. 



Ralston, H. J. (1939) The immediate and delayed action of X rays upon the proto- 

 zoan Dunaliella salina. Am. J. Cancer, 37: 288-297. 



Reed, E. A. (1943) Unilateral membrane formation in the sea urchin egg treated with 

 ultraviolet light. Anat. Record, 87: 467. 



(1948) Ultraviolet light and permeability of sea urchin eggs. J. Cellular 



Comp. Physiol., 31: 261-280. 



Rentschler, H. C, and A. C. Giese (1941) Injury and death resulting from micro- 

 second flashes of ultraviolet light. J. Cellular Comp. Physiol., 17: 395-397. 



Rigdon, R. H., and H. Rudisell, Jr. (1945) I'lffect of radiation on malaria. An 

 experimental study in the chick and duck. Proc. Soc. Exptl. Biol. Med., 59: 

 167-170. 



Robertson, M. (1935a) On the reduction in the multiplication of a protozoon (Bodo 

 caudatus) caused by exposure to gamma-ray irradiation with a study of the sensi- 

 tive period in the life of the cell. Brit. J. Radiol., 8: 502-527. 



(1935b) A study of the behavior of cultures of Hodo caudatus upon release 



