INDEX 



397 



54; 57; 59; 60; 63; 70; location of 

 sensitive structure in leaves, 71; 

 229; 235; 354. 



Davenport, theory of orientation, 

 40-42; definition of tropism, 55; 

 58; reactions of Amoeba to light, 

 74; movement in Amoeba affected 

 by change in light intensity, 78; 

 reactions of Stentor, 113; 234; 

 phototaxis and photopathy com- 

 pared, 254-256; effect of different 

 rays on reactions: 302, criticism 

 of, 343, 363; photochemical reac- 

 tions, 308. 



De Candolle, vitalism, 8; sleep 

 movements of leaves, 11; theory 

 of orientation in plants (heliotrop- 

 ism), 12; 13; 14; 27; 52; defini- 

 tion of tropism, 53; 54; 229; 234. 



Decoration, in crabs, 356-358. 



Dendrocoelum lacteum, 207. 



Descartes, philosophy of movement, 



6; 51- 



Dewar, 338; 349. 



Dexia carinifrons, 216. 



Dias longiremis, 337. 



Diatoms, 265; reactions of, in spec- 

 trum, 323, 326. 



Didinium nasutum, 126. 



Dodart, curvature of roots, 7. 



Driesch, definition of tropism, 56; 

 369; theory of vitalism, 374-378. 



Drosophila ampelophila, 216; effect 

 of intense light on, 271; change in 

 reaction of, 280. 



Du Bois-Reymond, 9. 



Du Hamel, cause of curvature in 

 plants, 7. 



Dutrochet, osmosis and movement 

 of plants, 12. 



Dutrochet and Pouillet, 314; 319. 



Earthworms, orientation of (Daven- 

 port), 40, 41; 50; locomotion, 199; 



trial in orientation, 200-206, 232; 

 distribution of sensitive tissue in, 

 201-205; accuracy of orientation, 

 205; reaction to sudden increase 

 of light intensity, 250; 257; 259; 



260; 343; 346. 



Echinaster crassispina, 211. 



Echinoderms, method of locomo- 

 tion, 211; orientation of, 21 1-2 13; 

 233; aggregation of starfishes, 244; 

 reactions of sea urchins to shad- 

 ows, 247; 260. 



Edwardsia, 250; 259; 299. 



Eigenmann, 238. 



Eloactis, reactions of (Hargitt), 



252. 



Energy, distribution in spectrum, 

 304-308, 360; distribution in spec- 

 trum compared with stimulating 

 efficiency, 332, 343. 



Engelmann, reactions of unicellular 

 forms to light, 16, 17; 42; 44; 57; 

 stimulation of pseudopods, 74; 

 method of aggregation in Euglena, 

 etc., 82; 94; function of eye-spot, 

 106-109; 235; methods of aggre- 

 gation compared with ideas of 

 Jennings, 240, 2,23, 324; 279; reac- 

 tions of unicellular forms in spec- 

 trum, 322-325. 



Entelechy, as a factor in regulation, 



377- 



Entomostraca, 258; 271; 278. 



Eudendrium, hydranths, mechanics 

 of orientation, 163, 164. 



Eudendrium, planulae of, orienta- 

 tion in light from two sources, 87; 

 description and locomotion, 159; 

 accuracy of orientation, 160; me- 

 chanics of orientation, 161-163; 

 aggregation of, 243; 271. 



Eudorina, orientation in light from 

 two sources, 87, 147; function of 

 eye-spot, 109, 147; structure of, 



