INDEX 



-♦♦- 



A. 



Allen, Mr. J. A., on variatioo 



under nature, 34. 

 Amixia, 12-28, 110-115, 117- 



133- 

 Apogamy, 5, 6, 10, 18, 28. 



Ij. 

 Belt, on physiological selection, 



44- 



Berg Sagnitz, Count, on self- 

 fertilization and variability, 177. 



Breeding, separate and segregate, 



5- 

 Butterflies of polar regions and 

 Alps, 133. 



C. 



Catchpool, Mr. , on physiological 



selection, 44, 137. 

 Cross-infertility, 46 ; and varietal 



divergence, 82 ; and diversity of 



life, 169; and stability, 170; 



and specific differentiation, 170; 



in domesticated cattle, 170; 



testing for, 172; Fritz MUller on, 



174. 



D. 



Darwin, Charles, on isolation, 

 3, 106; on diversity under 

 nature, 31 ; on the fertility of 

 varieties, 50 ; on the origin of 

 cross-infertility, 51 ; on distri- 

 bution, 68 ; on prepotency, 89 ; 

 on geographical isolation, loi, 

 108; on methodical selection. 



102 ; on modification in large 

 areas, 103 ; on the swamping 

 effects of intercrossing, 105 ; on 

 independent variability, 109 ; on 

 domestic animals, no. 



Delbceuf, law of independent 

 variability, 13. 



Differentiation under natural se- 

 lection, 37. 



Diversity of life and cross-infer- 

 tility, 169. 



Domesticated cattle and cross- 

 infertility, 170, 172. 



E. 



Evidences of physiological selec- 

 tion, 62. 



Evolution, monotypic and poly- 

 typic, 21, 75, 102, 107, 112, 

 129. 



Experimental research in physio- 

 logical selection, 85. 



F. 



Fertility of domesticated varieties, 



172. 

 FocKE, Herr, on hybridization, 



175- 



G. 



Galton, Mr. Francis, law of 



regression, 39. 

 General conclusions, 144. 

 Geographical distribution and 



physiological selection, 65. 

 GlARD, M., on apogamy, 14. 

 Grabham, Dr., on mollusca of 



Madeira, 135. 



N a 



