NOTES ON CHAPTER II 



1 Page 27. Changes and irregularities in the genetic system in relation 

 to the differentiation of varieties, species, etc., have been very fully 

 described and figured in C. C. Hurst's The Mechanism of Creative 

 Evolution (New York and Cambridge, 1932). See also T. H. Morgan, 

 The Theory of the Gene (New Haven, 1928) and The Scientific 

 Basis of Evolution (New York, 1932). 



^ Page 30. The work on Datura is by Blakeslee and his associates. See 

 A. F. Blakeslee and J. Belling, "Chromosomal Mutations in the Jimson 

 Weed, Datura stramonium," Journal of Heredity, Vol. 15, 1928, pp. 

 195-206; and the references there given. 



^ Page 41. For general accounts of gene mutations, see the references 

 given in Note i, above. 



* Page 50. See M. Demerec, "Reddish — A Frequently 'Mutating' Char- 

 acter in Drosophila virilis," Proceedings of the National Academy of 

 Sciences, 1926, Vol. 12, pp. 11-16. 



^ Page 50. See M. Demerec, "Miniature-Alpha — A Second Frequently 

 Mutating Character in Drosophila virilis," Proceedings of the National 

 Academy of Sciences, 1^26, Vol. 12, pp. 687-90. 



^ Page 51. For an account of variegation in Maize, see W, H. Eyster, 

 "A Genetic Analysis of Variegation," Genetics, 1924, Vol. 9, pp. 

 372-404. 



^ Page 52, See H. J. Muller, "Artificial Transmutation of the Gene," 

 Science, 1927, Vol. 66, pp. 84-7, and "Types of Visible Variations In- 

 duced by X-Rays in Drosophila," Journal of Genetics, 1930, Vol. 22, 



PP- 299-334- 



® Page 54. See V. Jollos, "Studien zum Evolutionsproblem. I. Ueber die 



experimentelle Hervorrufung und Steigerung von Mutationen bei 



Drosophila melanogaster," Biologisches Zentralblatt, 1930, Bd, 50, pp. 



541-54- 



^ Page 55. See H. H. Plough and P. T. Ives, "Heat-Induced Mutations 



in Drosophila," Proceedings of the National Academy of Sciences, 1934, 



Vol. 20, pp. 268-73. 



