ral 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. 41-2

Stevens, Samuel, i. 26, 48, 49, 54, 71, 72, 102, 105, 143

Stewart, Prof. Balfour, and telepathy, ii. 200

Strahan, Dr. A., and Wallace memorial, ii. 253

Strang, Mr., chalk portrait of Wallace by, ii. 224

Strasburger, Prof. Eduard, receives Darwin-Wallace Medal, i. 120;
tribute to Wallace, 120;
on Wallace's "Malay Archipelago," ii. 231

Stuart-Menteith, C.G., ii. 160

"Studies, Scientific and Social," Wallace's, ii. 143, 147

"Study of Variation, with regard to Discontinuity in Origin of Species,"
Bateson's, ii. 60-1

"Subsidence and Elevation of Land," Sir H.H. Howorth's, i. 277

---- theory of, i. 132, 160, 212, 238, 286, 309

Survival of the fittest, i. 125, 171, 174-5, ii. 59
(_see also_ Selection, natural)

Sus papuensis, i. 161, 162

---- scrofa, i. 162

Swinton, Mr. A.C., ii. 155

Synthetic philosophy, Spencer's, i. 1, 123, 124

Switzerland, Wallace's visits to, i. 35, ii. 204

T

Telepathy, ii. 181, 186 _et seq._, 196, 199

"Tendency of Varieties to Depart Indefinitely from Original Type,"
Wallace's, i. 109;
loss of MS., 127, ii. 7

Ternate, Wallace at, i. 36, 68, 107, 108;
volcanic erup