3 6o 



INDEX 



Bredig, properties of colloids, 317. 



Brittle star, behavior 240. 



Bryopsis swarm spores, reactions to light, 144. 



Budgett, theory of reaction to electric cur- 

 rent (with Loeb), 166. 



Bursaria, avoiding reaction, 114; reaction 

 to heat, 126, 305, 318, 322. 



Calvert, Mrs. P. P., behavior of earthworm, 



247. 



Carbon dioxide, reaction to, in Paramecium, 

 67, 297; in other infusoria, 122. 



Carchesium, 116; reaction to light, 142; ces- 

 sation of reaction to faint stimuli, 172. 



Carcinus, habit formation, 256. 



Carlgren, cause of reaction to electric cur- 

 rent, 165; ciliary action in sea anemones, 

 222. 



Cataphoric action, part played in reaction 

 to electricity, 164. 



Cathode, movement toward, in Paramecium, 



50, 83; in flagellates, 152; in ciliates, 

 152; in Spirostomum, 157; in Opalina, 

 162; general, 163. 



"Central nervous system" of medusas, 189. 

 Centrifugal force, reaction to, in Paramecium, 



51, 78; in other infusoria, 150. 

 Cerianthus, movement when without food, 



191; righting reactions, 195; reaction to 

 gravity, 195, 210; reaction of hetero- 

 morphic tentacles, 227. 



Chain reflexes, 251. 



Change of conditions as cause of reactions, 

 in Amceba, 19; in bacteria, 29, 37; in 

 Paramecium, 51, 56, 58, 67, 108; in other 

 infusoria, 123; in reactions to light, 131, 

 i33. 1 3 6 > Mi, 145. 2I 5I general, 293, 

 333- 



Chemical processes in organisms, 346. 



Chemicals, reaction to, in Amceba, 9; in 

 bacteria, 28-34; in Paramecium, 51, 53, 

 54, 62, 120; in Hydra, 198, 218; in me- 

 dusae, 220; in sea anemones, 224; inter- 

 ference with reaction to chemicals, 83, 

 96. 



Chilomonas, structure and behavior, in; 

 reaction to electric current, 152. 



Chlamydomonas, reaction to light, 142, 146; 

 to gravity, 149; to centrifugal force, 150. 



Choice, 330, 340; choice of food in infuso- 

 ria, 183. 



Chromatium, reactions, ^^, 35, 36. 



Chromulina, reactions to gravity, 149; re- 

 versal by heat, 150. 



Chytridium, reaction to light, 142. 



Cilia, in infusoria, 41; observation of move- 

 ments, 83; cathodic reversal under electric 

 current, 84; action in food taking of sea 

 anemones, 222; reversal in sea anemones, 

 223, 224, 227; cilia in sea urchin, 234. 



Ciliata, 41. 



Cnidaria, behavior of, 188-232. 



Cnidocil, 218. 



Coehn and Barratt, theory of reaction to elec- 

 tric current, 165. 



Ccelenterata, behavior of, 18S-232; reflexes 

 in, 133, 279; relation to tropism theory, 

 272. 



Cold, reaction to, in bacteria, 37; in Para- 

 mecium, 51, 53, 70; in other infusoria, 

 124; effect on Hydra, 205. 



Coleps, lack of reaction to gravity, 150. 



Colloids, dependence of properties on his- 

 tory, 317, 334. 



Color, reaction to, in Amceba, n; in bac- 

 teria, 36, 341; in Euglena, 140; in Hydra, 

 212. 



Colorless infusoria, usual lack of reaction to 

 light, 12S; cases of reaction to light, 142, 



333- 



Colpidium, avoiding reaction, 115; collec- 

 tion in acids, 122 ; lack of reaction to grav- 

 ity, 150; reaction to electric current, 155. 



Colpoda, lack of reaction to gravity, 150. 



Combinations of stimuli, in infusoria, 92. 



Compensatory movements, 75. 



Conduction of stimulation, in ccelenterates, 

 228; in Protozoa, 262. 



Condylactis, relation to gravity, 211. 



Congenital variations, 319, 320. 



Conjugation, behavior during, 102, 182. 



Consciousness, 328, 334, 335, 340. 



Contact reactions, in Amceba, 6; in bacteria, 

 27, 37; in Paramecium, 51, 54, 59, 60; 

 in other infusoria, 117; interference 

 with other reactions, 92-96, 119, 133; 

 cause of interference, 120. 



Contraction, in response to stimuli, in Para- 

 mecium, 89; in other infusoria, 114; in 

 Ccelenterata, 197; spontaneous contrac- 

 tions in infusoria, 181; in Hydra, 189; 

 in medusas, 191; rapid contraction in 

 Aiptasia, 228; local contractions in ccelen- 

 terates, 231; relation to tropism theory, 

 272; setting of contractions through repe- 

 tition in sea anemones, 206. 



Convoluta, habit formation, 255, 333; depen- 

 dence of reaction to gravity on past his- 

 tory, 258. 



Correlation of behavior in different parts of 

 ccelenterate body, 227, 229; in sea urchin, 

 252; in starfish, 239. 



Corymorpha, reaction to gravity, 210; reac- 

 tion of tentacles, 222. 



Crab, habit formation, 256, 290. 



Crayfish, habit formation, 255, 290. 



Creeping infusoria, reactions, 114; complex- 

 ity of behavior, 180. 



Crustacea, habit formation, 255, 290, 333. 



Cryptomonas, reaction to light, 142, 143, 146; 

 to electric current, 152. 



Currents, protoplasmic, in Amceba, 4; cur- 

 rents due to cilia in infusoria, 46, 60, 131; 

 observation of these currents, 83; cur- 





