1280 BIOLOGICAL EFFECTS OF RADIATION 



30. McKay, J. W., and T. H. Goodspeed. The efifects of x-radiation on cotton. 

 Science 71 : 633. 1930. 



31. MuLLER, H. J. Artificial transmutation of the gene. Science 66 : 84-87. 1927. 



32. MuLLER, H. J. Further studies on the nature and causes of gene mutations. 

 Proc. VI Int. Congr. Genet. 1: 213-252. 1932. 



33. NiSHiYAMA, I. On hybrids between Triticum spelta and two dwarf wheat plants 

 with 40 somatic chromosomes. Botan. Mag. Tokj^o 42: 154-177. 1928. 



34. NisHiYAMA, I. Genetics and cytology of certain cereals. II. Japanese Jour. 

 Genet. 7: 49-102. 1931. 



35. Patterson, J. T., and H. J. Muller. Are "progressive" mutations produced 

 by X-rays? Genetics 15 : 495-578. 1930. 



36. Sap^hin, A. A. Rontgen-Mutationenbeim Weizen (Triticum vulgare). Ztichter 

 2:257-259. 1930. 



37. Sprague, G. F. Some genetic effects of electromagnetic treatment in maize. 

 (Abst.) Anat. Rec. 47 : 382. 1930. 



38. Stadler, L. J. A genetic analysis of maize. Missouri Agr. Expt. Sta. Bull. 

 256. 69-71. 1927. 



39. Stadler, L. J. Genetic effects of x-rays in maize. Proc. Nat. Acad. Sci. 14: 

 69-75. 1928. 



40. Stadler, L. J. Mutations in barley induced by x-rays and radium. Science 

 68:186-187. 1928. 



41. Stadler, L. J. The rate of induced mutation in relation to dormancy, tempera- 

 ture, and dosage. (Abst.) Anat. Rec. 41: 97. 1928. 



42. Stadler, L. J. Chromosome number and the mutation rate in Avena and 

 Triticum. Proc. Nation. Acad. Sci. 15: 876-881. 1929. 



43. Stadler, L. J. Some genetic effects of x-rays in plants. Jour. Hered. 21: 3-19. 

 1930. 



44. Stadler, L. J. The frequency of mutation of specific genes in maize. Anat. 

 Rec. 47:381. 1930. 



45. Stadler, L. J. The experimental modification of heredity in crop plants..!. 

 Sci. Agric. 11: 557-572. 1931. [.See also (a) Ibid. 11: 645-661. 1931. (Paper 

 II.)] 



46. Stadler, L. J. On the genetic nature of induced mutations in plants. Proc. VI 

 Int. Congr. Genet. 1: 274-294. 1932. 



47. Stadler, L. J. On the genetic nature of induced mutations in plants. II. 

 Missouri Agr. Expt. Sta. Res. Bull. 204. 1933. 



48. Stein, E. t)ber den Einfluss von Radiumbestrahlung auf Antirrhinum. Zeitsch. 

 Indukt. Abstamm. und Vererbungsl. 29: 1-15. 1922. {See also (a) Ibid. 43: 

 1-87. 1926.) 



49. Stein, E. Weitere Mitteilung iiber die durch Radium-Bestrahlung induzierten 

 Gewebe-Entartungen in Antirrhinum (Phytokarzinoine) und ihr erbliches 

 Verhalten. Biol. Zentralbl. 50 : 12^158. 1930. 



50. Stein, E. Zur Entstehung und Vererbuag der durch Bestrahlung erzeugten 

 Phytokarzinome. Zeitsch. Indukt. Abstamm. und Vererbungsl. 62: 1-13. 

 1932. 



51. Stubbe, Hans. Untersuchungen iiber experimentelle Auslosung von Mutationen 

 bei Antirrhinum majus. I. Zeitsch. Indukt. Abstamm. und Vererbungsl. 66: 

 1-38. 1930. (See also for Papers II-IV (a) Ibid. 66: 202-232. 1930; (6) 60: 

 474-513. 1932; (c) 64: 181-284. 1933.) 



52. Timof^eff-Ressovsky, N. W. Mutations of the gene in different directions. 

 Proc. IV Internat. Congr. Genet. 1: 308-328. 1932. 



Manuscript received by the editor March, 1934. 



I 



