characteristics: relation to environment 265 



in the seriously defective groups, have marked powers of 

 adjusting themselves to many different conditions and of 

 following many different lines of action, depending on the 

 conditions in which they live. 



In no other organism than man is so full an analysis pos- 

 sible of the relative roles of genetic constitution and en- 

 vironment in determining the mental and temperamental 

 characteristics, for In no other organism are these charac- 

 teristics highly developed. 



NOTES AND REFERENCES ON CHAPTER X 



1. Page 243. T. H. Morgan (1915), The Role of Environment in 

 the Realization of a Sex-linked Mendelian Character in Drosophila. 

 Amer. Naturalist, vol. 49, pp. 385-429. 



2. Page 243. M. A. Hoge (1*915), The Influence of Temperature 

 on the Development of a Mendelian Character. Journal of Experi- 

 mental Zoology, vol. 18, pp. 241-285. 



3. Page 244. See C. B. Bridges and E. Gabritschevsky (1928), The 

 Giant Mutation in Drosophila melanogaster. Zeitschrift fiir Induktive 

 Abstammungs-und Vererbungslehre, Bd. 46, pp. 231-284. 



4. Page 245. R. A. Emerson (1921), The Genetic Relations of 

 Plant Colors in Maize. Memoir 19 of Cornell University Agricultural 

 Experiment Station, 156 pages, 11 plates. 



5. Page 247. See J. Krafka (1920), The Effect of Temperature 

 upon Facet Number in the Bar-eyed Mutant of Drosophila. Journ. of 

 General Physiology, vol. 2, pp. 409-464. See also the papers cited by 

 Krafka. 



6. Page 249. P. Kammerer (1913), Das Farbkleid des Feuer sala- 

 manders {Salamandra maculosa Laurenti) in seiner Abhdngigkeit 

 von der Umwelt. Archiv f. Entwicklungsmechanik, Bd. 36, pp. 3— 

 193, 16 plates. 



7. Page 254. For references on twins, see Note 5, VIII. 



8. Page 257. T. Komai and G. Fukuoka (1934), Post-natal 

 Growth Disparity in Monozygotic Twins. Journal of Heredity, vol. 

 25, pp. 423-430. 



9. Page 257. H. W. Siemens (1927), The Diagnosis of Identity in 

 Twins. Journal of Heredity, vol. 18, pp. 201-209. 



10. Page 259. For references to the papers of Newman and of Mul- 

 let, see Note 5, Chapter VIII. 



