INDEX 



ALLEN, Mr. J. A., on variation 



under nature, 34. 

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



133- 

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



BELT, on physiological selection, 



44- 

 BERG SAGNITZ, Count, on self- 



fertilization and variability, 177. 

 Breeding, separate and segregate, 



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. 

 2, 106 ; on diversity under 

 nature, 31 ; on the fertility of 

 varieties, 50; on the origin oi 

 cross-infertility, 51; on distri- 

 bution, 68 ; on prepotency. 89 ; 

 on geographical isolation, 101, 

 108; on methodical selection. 



N 



1 02 ; 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- 

 i; fertility, 170, 172. 



E. 



Evidences of physiological selec- 

 tion, 62. 



Evolution, monotypic and poly- 

 typic, 21, 75, 102, 107, in, 

 129. 



Experimental research in physio- 

 logical selection, 85. 



F. 



Fertility of domesticated varieties, 



172. 

 FocKE, Herr, on hybridization, 



75- 



G. 



GALTON, Mr. Francis, law of 



regression, 39. 

 General conclusions, 144. 

 Geographical distribution and 



physiological selection, 65. 

 GIARD, M., on apogarm . .4. 

 GRABHAM, Dr., on mollusca of 



Madeira, 135. 



2 



