180 



INDEX 



Darwin, 9, 161, 175. 

 Description as philosophical cat- 

 egory, 13. 



Description embryology, 37. 

 Development, 5. 

 Differentiation, 5. 

 Diversity, individual, 81. 

 Doncaster, 34. 



Double cousins, 121, 123, 125, 

 Drosophila, 31. 



East, 16, 145, 149, 175. 



Eggs, yield of, 167. 



Ely, 166. 



Embryological method in genet- 

 ics, 35 ff. 



Enriques, 14. 



Entvncklungsmechanik, 35. 



Expectation, 30. 



Experimental method, 13, 18, 20, 

 62. 



Factors, multiple, 21, 27. 



Fallacy of qualitative inference, 

 28. 



Feathers, 8, 32. 



Fecundity, 17, 67. 



Fiddler crab illustration, 96. 



First-cousin X first-cousin mat- 

 ing, 121 ff. 



Fish, 150. 



Fluctuating variation, 48. 



Free generations, 108. 



Galton, 9, 10, 11, 17, 42, 43, 49. 



Gametogenesis, 4, 12, 24. 



Generation interval in cattle, 

 128. 



Genetics and breeding, 159 ff. 



Genetic bearing of inbreeding re- 

 sults, 147 ff. 



Genetics, practical results of, 

 171 ff. 



Genotype, 65. 

 Germ cell, 4, 27. 

 Group description, 56. 

 Gurwitsch, 36. 

 Guyer, 41. 



Hagedoorn, A. C., 17. 



Hagedoorn, A. L., 17. 



Hatai, 22. 



Hatschek, 41. 



Hayes, 16, 145, 149. 



Henry VIII, 163. 



Heredity, problem of, 2 ff. ; cate- 

 gories of, 3. 



Heterogeneity measured by cor- 

 relation coefficient, 69. 



Hoesch, 102. 



Holstein cattle, 144, 167. 



Homozygosis, coefficient of, 155. 



Homozygotes, proportion of, in 

 inbreeding, 149 ff. 



Horse, 107, 163. 



Hurst, 161. 



Inbreeding, 101 ff. 



Inbreeding, calculation of co- 

 efficients of, 111 ff; curve of, 

 110, 116. 



Inbreeding, definition of, 106. 



Individual, importance of in bio- 

 logical analysis, 48. 



Intensity of inheritance, 65. 



Jacobs, 155. 



Jennings, 6, 7, 13, 58, 67, 69, 89, 



149, 155. 

 Jersey cattle, 128, 129, 136 ff., 144. 



169. 

 Johannsen, 65, 67, 69. 



Kelvin, 50. 



Kinds of knowledge given by 

 statistics, 79. 



