624 RADIATION BIOLOGY 



in Tradescantia as modified by near infrared radiation. Proc. Natl. Acad. Sci. 

 U.S., 32: 295-302. 



, , and B. N. Kaufmann (1948) Modification of the X-ray and ultra- 

 violet induced mutation rate in Aspergillus terreus by pretreatment with near 

 infrared radiation. Genetics, 33: 429-437. 



^ W. D. McElroy, and H. Miller (1949) The effect of nitrogen mustard pre- 

 treatment on the ultra-violet-induced morphological and biochemical mutation 

 rate. Proc. Natl. Acad. Sci. U.S., 35: 513-518. 



and H. T. Yost, Jr. (1951a) The action of infrared radiation on the chromo- 

 somes of Tradescantia. Records Genet. Soc. Am., 20: 127; Genetics, 36: 579. 

 and (1951b) The induction of activated, stable states in the chromo- 



somes of Tradescantia by infra-red and X-rays. Proc. Natl. Acad. Sci. U.S., 37 

 796-802. 



Tatum, E. L. (1946) Induced biochemical mutations in bacteria. Cold Spring 

 Harbor Symposia Quant. Biol., 11: 278-284. 



(1950) Effects of radiation on fungi, in Symposium on radiation genetics, 



Oak Ridge, 1948. J. Cellular Comp. Physiol., 35 (Suppl. 1): 119-131. 



Thoday, J. M. (1942) The effects of ionizing radiations on the chromosomes of 

 Tradescantia bracteata. A comparison between neutrons and X-rays (with a 

 section on neutron dosimetry by D. E. Lea). J. Genet., 43: 189-210. 



and J. Read (1947) Effect of oxygen on the frequency of chromosome aber- 

 rations produced by X-rays. Nature, 160: 608. 



and (1949) Effect of oxygen on the frequency of chromosome aber- 



rations produced by alpha-rays. Nature, 163: 133-134. 

 Thomas, H. (1936) Cosmic rays and the origin of species. Nature. 137: 51-53, 97- 



98, 358-359. 

 Timofceff-Ressovsky, N. W. (1931a) Die bisherigen Ergebnisse der Strahlengenetik. 



Ergeb. med. Strahlenforsch. (Leipzig), 5: 129-228. 

 (1931b) Einige Versuche an Drosophila melanogaster liber die Art der 



Wirkung der Rontgenstrahlen and den Mutationsprozess. Arch. Entwick- 



lungsmech. Organ., 124: 654-665. 



(1931c) Does X-ray treatment produce a genetic after-effect? J. Heredity, 



22: 221-223. 



(1932a) Mutations of the gene in different directions. Proc. Intern. Congr. 



Genet. 6th Congr. Ithaca, 1 : 308-330. 



(1932b) Verschiedenheit der "normalen" Allele der white-Serie aus zwei 



geographisch getrennten Populationen von Drosophila melanogaster. Biol. Zentr., 

 52: 468-476. 



(1937a) Experimentelle Mutationsforschung in der Vererbungslehre. Be- 



einflussung der Erbanlagen durch Strahlung und andere Faktoren. T. Steinkopf, 

 Leipzig. 



(1937b) Zur Frage iiber einen "direkten" oder "indirekten" Einfluss der 



Bestrahlung auf den Mutationsvorgang. Biol. Zentr., 57: 233-248. 



(1938) Auslasung von Mutationen durch Neutronenbestrahlung. For- 



schungen u. Fortschr., 14: 165-166. 



(1939) Zur Frage der Beziehungen zwischen strahlenausgelosten Punkt- 



und Chromosomenmutationen bei Drosophila melayiogaster . Chromosoma, 1: 

 310-316. 



and M. Delbriick (1936) Strahlengenetische Versuche iiber sichtbare Muta- 

 tionen und die Mutabilitat einzelner Gene bei Drosophila melanogaster. Z. 

 indukt. Abstamm. u. Vererbungslehre, 71: 322-334. 



— and K. G. Zimmer (1935a) Strahlengenetische Zeitfaktorversuche an 

 Drosophila melanogaster. Strahlentherapie, 53: 134-138. 



