INDEX

A.
Allen, Mr. J. A., on variation under nature, [34].
Amixia, [12]-[28], [110]-[115], [117]-[133].
Apogamy, [5], [6], [10], [18], [28].
B.
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 Müller on, [174].
D.
Darwin, Charles, on isolation, [2], [106];
on diversity under nature, [31];
on the fertility of varieties, [50];
on the origin of cross-infertility, [51];
on distribution, [68];
on prepotency, [89];
on geographical isolation, [101], [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, [110].
Delbœuf, law of independent variability, [13].
Differentiation under natural selection, [37].
Diversity of life and cross-infertility, [169].
Domesticated cattle and cross-infertility, [170], [172].
E.
Evidences of physiological selection, [62].
Evolution, monotypic and polytypic, [21], [75], [102], [107], [112], [129].
Experimental research in physiological 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].
Giard, M., on apogamy, [14].
Grabham, Dr., on mollusca of Madeira, [135].
Gulick, Rev. J., on natural Selection as a mode of isolation, [9];
on divergence, [11];
on segregate breeding, [19];
on geographical distribution, [27];
on the prevention of intercrossing, [127];
on Mr. Wallace's criticisms, [151].
H.
Herbert, on hybridization, [173];
advance on his position, [174].
Herdman, Prof., on physiological isolation, [123].
Historical sketch of opinions on isolation, [101].
Homogamy, [5], [6];
forms of, [7], [19], [29].
Hybridization, Herbert on, [173];
in plants, [175].
Hypothesis, additional, concerning physiological selection, [178].
I.
Independent variability, [12]-[29].
Isolation, defined, [2];
forms of, [3], [6];
geographical, [3];
discriminate and indiscriminate, [5];
physiological, [9], [41], [58];
its importance, [39];
sketch of opinions on, [101];
general conclusions, [144];
Seebohm on, [173].
J.
Jordan, M., on cross sterile varieties of plants, [86];
his researches summarized, [87].
K.
Kerner, Prof. A., on prepotency, [176].
L.
Lankester, Prof. Ray, on divergent evolution, [15].
Le Conte, Prof., on fossil snails of steinheim, [95];
on isolation, [129].
Livingstone, Dr. David, Quoted, [123].
M.
Meldola, Prof., on difficulty from intercrossing, [121].
Misunderstandings of Physiological selection, [59].
Monotypic evolution, see Evolution.
Morgan, Prof. Lloyd, on sterility, [56];
on isolation, [128].
Moulton, Mr. Fletcher, an examination of Mr. Wallace's calculations on physiological selection, [157].
Müller, Fritz, on cross-infertility, [174].
N.
Nägeli, on isolation, [76];
on synoicy, [78], [82].
Natural selection, a form of discriminate isolation, [9], [10], [23];
leads to monotypic evolution, [24]-[29];
difficulties of, [41], [51].
P.
Panmixia, [12].
Physiological selection, [9], [41];
summarized, [58];
misunderstandings of, [59];
evidences of, [81]-[119];
and Weismannism, [169];
additional hypothesis, [178].
Polytypic evolution, see Evolution.
Prepotency, [89];
importance of, [176].
S.
Schmidt, Prof. Oscar, on domesticated cattle, [171].
Seebohm on isolation, [173].
Segregation, [28].
Selection, physiological, see Physiological selection.
Self-fertilization and variability, [177].
Snails of Sandwich Islands, [16], [130];
fossil of Steinheim, [95].
Specific differentiation and cross-infertility, [170].
Stability and cross-infertility, [170].
Synoicy, [78].
T.
Topographical distribution and physiological selection, [74];
of varieties, [81].
Transformation, serial and divergent, [21], [121].
V.
Variability and self-fertilization, [177].
Variation in birds, [34].
Varieties, topographical distribution of, [81].
W.
Wagner, Maritz, [3];
on geographical isolation, [76];
quoted, [103];
law of migration, [111].
Wallace, Mr. A. R., [3], [17];
quoted, [34], [47], [51], [57],[130]-[136];
criticized by Gulick, [152].
Weismann, Prof., on geographical isolation, [76], [114]-[118].
Weismannism and physiological selection, [169].