196
"Sociology, Principles of," i. 126
"---- Study of," Spencer's, i. 283
Solar nebula, lecture by Sir R. Ball on, ii. 174
---- system, central position of, ii. 171
South America, fauna of, ii. 10
Special creation, i. 189 (note), 190, 192, ii. 23, 185
Species, mutability of, i. 78, 137;
law of introduction of, 96, 101-2;
extinction of, 98.
(_See also_ Selection, natural)
Spencer, Herbert, birth of, i. 5;
and Evolution, 122, 123;
arguments with Huxley on Evolution, 123;
sends Darwin a copy of his Essays, 124;
suggests "survival of the fittest" as alternative to "natural
selection," 125, 171;
Wallace's relations with, 125;
Darwin's approval of "survival of the fittest," 174;
autobiography of, ii. 211
---- letters from:
on "Origin of the Races of Man," ii. 18;
on theory of flight, 27-8;
on "Darwinism," 47;
on Lord Salisbury's view of Natural Selection, 59, 60, 65;
on Land Nationalisation Society, 154;
on "Progress and Poverty," etc., 154-5
Spilosoma menthastri, i. 179
Spiritualism, Wallace's belief in, ii. 122, 167, 178, 181 _et seq._,
239-40;
Huxley on, 187;
Lord Avebury on, 212
Spiritualists, Association of, ii. 198, 199
Spontaneous generation, i. 274
Spruce, Mr., i. 150, 161, 166, 232
Stanley, Dean, at Linlathen, ii. 228
Stephens' "Illustrations of British Insects," i. 23 (note)
Sterility, Natural Selection and, Meldola on, ii.
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