CHROMOSOME ABERRATIONS IN ANIMALS 709 



Sonnenblick, B. P. (1940) Cytology and development of the embryos of X-rayed 

 adult Drosophila melanogaster . Proc. Natl. Acad. Sci. U.S., 26: 373-381. 



and P. S. Henshaw (1941) Influence on development of certain dominant 



lethals induced by X-rays in Drosophila germ cells. Proc. Soc. Exptl. Biol. 

 Med., 48: 74-79. 



Sparrow, A. H. (1944) X-ray sensitivity changes in meiotic chromosomes and the 

 nucleic acid cycle. Proc. Natl. Acad. Sci. U.S., 30: 147-155. 



(1948) Relative X-ray sensitivity of metaphase and interphase chromosomes. 



Nature, 162: 651. 



(1951) Radiation sensitivity of cells during mitotic and meiotic cycles with 



emphasis on possible cytochemical changes. Ann. N. Y. Acad. Sci., 51: 1508- 

 1540. 



and M. Maldawer (1950) Differential rejoining as a factor in apparent 



sensitivity of chromosomes to X-ray breakage. Proc. Natl. Acad. Sci. U.S., 

 36: 636-643. 



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



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



Spear, F. G. (1946) The biological effects of penetrating radiations. A review. 

 Brit. Med. Bull., 4: 2-10. 



Stern, C. (1926) Eine neue Chromosomenaberration von Drosophila melanogaster 

 und ihre Bedeutung fur die Theorie der linearen Anordnung der Gene. Biol. 

 Zentr., 46: 505-508. 



■ (1929) Untersuchungen fiber Aberrationen des Y-Chromosoms von Drosoph- 

 ila melanogaster. Z. indukt. Abstamm.- u. Vererbungsl., 51: 253-353. 



(1931) Zytologisch-genetische Untersuchungen als Beweise flir die Mor- 



gansche Theorie des Factorenaustauschs. Biol. Zentr., 51: 547-587. 



(1936) Somatic crossing over and segregation in Drosophila melanogaster. 



Genetics, 21: 625-730. 



Stowell, R. E. (1945) The effects of roentgen radiation on the thymonucleic acid 

 content of transplantable mammary carcinomas. Cancer Research, 5: 169-178. 



Str0mnaes, 0istein (1949) The production of dominant lethals with X-rays in aged 

 Drosophila melanogaster sperm. Genetics, 34: 462-474. 



Sturtevant, A. H. (1926) A cross-over reducer in Drosophila melanogaster due to 

 inversion of a section of the third chromosome. Biol. Zentr., 46: 697-702. 



(1931) Known and probable inverted sections of the autosomes of Drosophila 



melanogaster. Carnegie Inst. Wash. Pub. 421, pp. 1--27. 



Sutton, E. (1940) Terminal deficiencies in the X chromosome of Drosophila melano- 

 gaster. Genetics, 25: 628-635. 



(1943) A cytogenetic study of the yellow-scute region of the X-chromosome 



in Drosophila melanogaster. Genetics, 28: 210-217. 



Swanson, C. P. (1943) Differential sensitivity of prophase pollen tube chromosomes 

 to X-rays and ultraviolet radiation. J. Gen. Physiol., 26: 485-494. 



(1947) X-ray and ultraviolet studies on pollen tube chromosomes. II. The 



quadripartite structure of the prophase chromosomes of Tradescantia. Proc. 

 Natl. Acad. Sci. U.S., 38: 229-232. 



Swift, H. H. (1950) The desoxyribose nucleic acid content of animal nuclei. Phys- 

 iol. Zool., 23: 169-198. 



Tansley, K., L. H. Gray, and F. G. Spear (1948) A preliminary note on some biologi- 

 cal effects of alpha radiation on the frog tadpole. Brit. J. Radiology, 21 : 567-570. 



Taylor, B., J. P. Greenstein, and A. Hollaender (1948) Effects of X-radiation on 

 sodium thymus nucleate. Arch. Biochem., 16: 19-31. 



Taylor, W. R. (1924) The smear method for plant cytology. Botan. Gaz., 78: 

 236-238. 



