GENETIC VARIATIONS 365 



Hervorrufimg und Steigerung vbn Mutationen bei Drosophila melano- 

 gaster. Biologisches Zentralblatt, Bd. 50, pp. 541—554. 



8. Page 350. H. H. Plough and P. T. Ives (1935), Induction of 

 Mutations by High Temperature in Drosophila. Genetics, vol. 20, 

 pp. 42-69. 



9. Page 350. On unstable mutations, see H. Stubbe (1933), Labile 

 Gene. Bibliographia Genetica, vol. 10, pp. 299-356. 



10. Page 351. M. Demerec (1926), Reddish — A Frequently 

 "Mutating" Character in Drosophila virilis. Proc. Nat. Acad. Sci., 

 vol. 12, pp. II-16. — ( 1926), Miniature-Alpha — A Second Frequently 

 Mutating Gene in Drosophila virilis. Proc. Nat. Acad. Sci., vol. 12, 

 pp. 687-690. 



11. Page 353. For an account of variegation in Maize, see W. H. 

 Eyster (1924), A Genetic Analysis of Variegation. Genetics, vol. g, 



pp. 372-404. 



12. Page 354. Reviewed in the paper of Stubbe, Note 9 above. 



13. Page 354. O. Johnston and A. M. Winchester (1934), Reverse 

 Mutations in Drosophila melanogaster. Amer. Naturalist, vol, 68, 



pp. 351-358. 



14. Page 356. See the account in the paper of H. J. Muller (1932), 

 referred to in Note 4, Chapter XIII. 



15. Page 360. W. R. Horlacher and D. T. Killough (1933), Pro- 

 gressive Mutations Induced in Gossypium hirsutum by Radiations. 

 Amer. Naturalist, vol. 67, pp. 532-538. 



16. Page 362. For discussion of the "position effect," see the paper 

 of Schultz and Dobzhansky, referred to in Note 6 of Chapter XIII, 

 and the other papers referred to by these two authors. 



