_Cosmos_ and its Cause, 86 _seq._ Croll, Mr.--on force and its determination, 94-96 Crookes, Sir W.--on renovation of energy, 26; on radium and radio-activity, 42, 43 Cryptogamous plants, fossil history, 219 Crystallization, 63, 64 Darwin, Mr.--on the "law of continuity," 57; on spontaneous generation, 58; on the mental gulf between man and brute, 71; on the origin of language, 79, 178; on "creation," 91; on the structure of the eye, 91; on chance as a factor of the world, 116; on pain and suffering as an objection to design, 119; disclaims achievements attributed to him, 150; his system, 153 _seq._ (see _Darwinism_); his mode of arguing, 178; dogmatism, 179; pleads lack of knowledge as an argument, 182; on single origin of every species, 210, 254; on genealogy of the Horse, 259; on the imperfection of the geological record, 264 Darwinism, 149 _seq._; false representations of, 149-151; sketch of system, 151-157; facts favouring, 158-160; difficulties of, 160 _seq._; explains no origins, 161; ignores the prime factor, _ibid._; improbabilities, 166, 173; does not explain initial developments, 170 _seq._; nor artistic ornamentation, 175; specious arguments too easily forthcoming, 177; does not account for organic progression, 187; scientific opinions concerning, 198 _seq._, 281 Dawson, Sir J. W.--on the first origin of life, 208; on the history of animal life, 223; on genealogy of the _Equidæ_, 247; of the _Cetacea_, 257; of bats, 258; on lack of palæontological evidence for evolution, 260 Design, evidence of, in Nature, 90, 97 _seq._; Kant on the necessity of, 150 Determination of force, its necessity, 94-96, 114 Determinism of the will, 81 _seq._ Development of organic types, 146 Dicotyledons, appearance of, 220 Diderot--on evidence of intelligence in Nature, 125 _Dinotherium_, classification of, 259 n Dogs, their vocal expression of emotions, 73 Du Bois-Reymond, Herr,--on the "Seven Enigmas," 31-33; on the progress of human development, 68, 69; on Haeckel's genealogies, 264 _Dysteleology_, 190 Ear, structure of, 93 _Electrons_, 42 Elephant and Tortoise of Hindu astronomy, 107 Embryology and Evolution, 158-160, 192 _seq._ "Energy," 23; conservation of, _ibid._; dissipation of, 24 _seq._; renovation of, 26-28 "Enigmas, the Seven," 32 _Entropy_, 25 _Equidæ_. See _Horse_ Ether, a constituent of the universe, 36 Evil, Origin of, the darkest of mysteries, 120 "Evolution," different meanings of term, 8; as an operative law, 10-14; eternal, 11; as a philosophy, 22 _seq._; formula of, 145 As a process, 45 _seq._ Organic, 142 _seq._; essential characters of theory, 147, 206; nature of evidence required, 208 _seq._; history of in vegetable and animal kingdoms, 216 _seq._ Eye, origin of, 91, 154 Helmholtz, on defects of, 91 n.; structure of, 155 n.; evolution of, 168