INDEX 



395 



Bronn, 250. 



Brooks, response to a sign, 250. 



Bryopsis, 274. 



Bufo americanus, orientation in 

 light from two sources, 89, 219- 

 221; 214; orientation with one eye 

 destroyed, 221, 222. 



Bulman, 354. 



Buttel-Reepen, 354. 



Butterfly, Mourning-clock. See Va- 

 nessa antiopa. 



Calliphora vomitoria, 217. 



Caprella, 214; structure and loco- 

 motion, 224; 271. 



Carbon dioxid, effect of, on rever- 

 sal of reactions, 279-283, 300. 



Cardium, 247. 



Caridea, orientation in zoeae of, 226. 



Carpenter, on circus movements, 

 216; reactions of Drosophila, 271, 

 280. 



Cartesian doctrine, 9. 



Cassiopea, 359. 



Cerianthus, 250; 252; 254. 



Change of intensity, 17; orientation 

 by, in Euglena, 99. See Light. 



Chaetomorpha aerea, 274. 



Chemicals, changes in, related to 

 reactions, 270, 278, 308-312, 320, 

 363, 364, 370; effect of, on re- 

 versal in reactions, 279-283, 300, 

 367; extent of effect of, on reversal 

 in reactions, 280; reactions of, 

 reversible in Hght (Stobbe), 308- 

 312; effect of different rays on re- 

 actions of, and cause of, 312, 360, 

 363; effect of mixed rays of light 

 on reactions of, 310, 363; same 

 compared with effect of mixed 

 rays on organisms, 335, 336; effect 

 of, on reactions of organisms in 

 spectrum, 323-325, 2,2>2, 343- 



Chilomonas curvata, 274. 



Chlamydomonas, orientation in 

 light from two sources, 87; func- 

 tion of eye-spot, 109, 133; struc- 

 ture of, 131; mechanics of orien- 

 tation, 132, 133; 134; 136; 146; 

 229; 230; adaptation, 236; aggre- 

 gation of, 241; 257; 259; reversal 

 in reactions and effect of tempera- 

 ture on, 265, 267, 277, 280, 300; 

 reversal in reactions compared 

 with same in Arenicola, 283; 367; 



370. 



Chlorogonium, structure of, 134; 

 function of eye-spot in, 134; ag- 

 gregation of, 241; 257; 259. 



Chromulina, 273. 



Chytridium vorax, 274. 



Ciesielski, 20. 



Ciliates, 229; 230; 232; 233; 240; 

 aggregation of, 242; reactions in 

 spectrum, 323, 324. 



Ciona, 250. 



Circus movements, in various species, 

 215-218. 



Claparede, 247. 



Classification, of reactions to light, 

 253-262. 



Claviceps, 318. 



Clepsine, reactions to shadows, 249; 

 257; 260; 263; 298. 



Cohn, ray-direction and movement 

 of organisms, 15; effect of different 

 rays (unicellular forms), 321, 322. 



Cole, L. J., 182; reactions of Bi- 

 pahum to light, 207; 214; 223; 

 effect of size of light area on re- 

 actions, 227; 228; 244. 



Cole, L. W., 360. 



Color, wave-length of, 304; energy 

 in, 304, 305; brightness of, 305- 

 308; effect of, on reactions: 

 chemical, 308-312, Daphnia, 310, 

 336-341, Hydra, 310, 333-33^, 

 plants, 310, 313-320, unicellular 



