tion of 1849 in, 68;
Wallace's paper on Natural Selection sent to Darwin from, i. 106, ii. 39

Tertiary Period, i. 159, 292, 294, 295

Thayer's theory of animal colouring, ii. 36

"Theories of Evolution," Poulton's, ii. 61

"Theory of Development and Heredity," Orr's, ii. 60

"---- of Natural Selection from a Mathematical Point of View," Bennett's,
i. 253

"---- of Population," Spencer's, i. 124

Thiselton-Dyer, Sir W.T.:
appreciation of Wallace by, i. 4;
at Darwin-Wallace Jubilee, 122;
paper on geographical distribution of plants by, ii. 90

---- letters from:
on Darwin Commemoration volume, ii. 91;
on Sir F. Darwin's "Foundations" and the Darwin celebration, 92;
on Evolution and the fundamental powers and properties of life, 95-8;
asking Wallace to join Royal Society, 219, 220-1;
on Romanes' charge of plagiarism, 236-7

Thompson, Prof. Silvanus P., signs petition for national memorial to
Wallace, ii. 253

Thomson, Prof. J.A., ii. 12 (note)

---- Sir W. (Lord Kelvin), on age of world, i. 242, 250, 268, ii. 75

Thought transference (_see_ Telepathy)

"Threading my Way," R.D. Owen's, ii. 225

Timor, birds of, i. 80, ii. 4;
mammalia of, i. 133, ii. 4;
fossils of, i. 138, 148, 290;
Darwin receives honeycomb from, 143, 146;
flora of, 237

Transmutation of species, i. 123, ii. 23

"Travels on the Amazon and Rio Negro," Wallace's, i, 30, 35

Trees, tropical, i. 86

Trimen, Mr., paper on mimetic butterflies by, i. 200, 201

Trimorphism in plants, i. 161, 202, 220

Tropical forests, Darwin's description of, i. 31-2;
denizens of, 31

"---- Nature," Wallace's, ii. 11

Turner, Dr., orchids of, ii. 114

---- Mr. H.H., signs petition for national memorial of Wallace, ii. 253

Tylor, E.B., "Early History of Mankind," i. 164;
Wallace on, 165;
"Anthropology," ii. 65

Tyndall, John, birth of, i. 5;
and psychical research, ii. 198

U

Uaupes, Indians of, i. 31;
exploration of, i. 29

Unfit, segregation of, ii. 160-1, 246

United States, Wallace's lecturing tour in, ii. 14

"Unparalleled Discoveries of Mr. T.J.J. See, Account of," ii. 178

Utricularia, i. 284-5

V

Vaccination, Wallace and, ii. 149, 202, 237, 240-1;
Rev. H. Price Hughes on, 158;
Frederic Myers and, 206

"Variation, Heredity, and Evolution," Lock's, ii. 84

---- of birds, i. 162-3

"Variations of Animals and Plants under Domestication," Darwin's,
i. 112, 189, 1