INDEX 



291 



Morgan, C. Lloyd, 10, 114, 138, 190, 



animal intelligence, 248 

 behavior of protozoa, 63 

 consciousness in animals, 4 

 deferred instincts, 96 

 evolution of instinct, 121 

 fear of hawks not innate, 123 

 homing of limpets, 187-189 

 imitation in chicks, 254 

 intelligence in chicks, 165; in 

 dog, 234, 235; in stickle- 

 back, 226 



instinct and internal impul- 

 sion, 108, 109 

 intelligence in solitary wasp, 



203, 204 



Lamarckism rejected, 124 

 organic selection, 136 

 principle of, 159, 234 

 varied behavior of Clepsine, 



111, 112 



Morgan's law, 159, 234 

 Morse, M., tidal rhythms of 



Littorina, 157 

 Mosquitoes, geotaxis, 32 



reaction of larvae to shadows, 



142 



Moth, tropisms, 18 

 Motor reflex, in Euglena, 28, 44, 45 

 in Loxophyllum, 79, 80 

 in Paramoecium, 15, 73, 74, 76 

 in Stentor, 44, 81, 82 

 Mound-building bird, instinct of 



flight, 97 

 Murbach, L., geotaxis in Gon- 



ionemus, 30 

 Mysis, geotaxis, 31 



Nagel, W. A., 61, food taking in 



anemones, 150, 151 

 light reactions of molluscs, 41 



Natural selection, origin of instinct 

 by, 134 ff 



Necturus, intelligence, 227 



Nephelis, phototaxis, 44 



Nereis, thigmotaxis, 36 



Nervous system, of crayfish, 101 

 Nightingale, variation in singing 



instinct, 133 

 Norman, W. W., pain sensations in 



lower animals, 8 

 Notonecta, phototaxis, 55 

 Nuel, J. P., 61 



Octopus, intelligence, 188, 189 

 Ocypoda, intelligence, 184 

 Odynerus, instinct, 118 

 Oelzelt-Newin, A., 90, food taking 



in Loxophyllum, 80 

 Orang, intelligence, 267 

 Orbitolites, thigmotaxis, 34 

 Orchestia, phototaxis, 46, 48, 49, 



51,55 



Organic selection, 136-138 

 Osborn, H. F., organic selection, 



136 



Osmia, parental instincts, 120 

 Ostrich, imitation in young, 254 

 Oxytricha, forming of groups, 24 

 thigmotaxis, 35 



Pachygrapsus, intelligence, 187 

 Pagurus, intelligence, 186 

 Pain, 6, 164 ff 

 Palsemon, 32 



statocysts, 31 ff 



Palaemonetes, change of photo- 

 taxis, 49 



Paley, W., conception of instinct, 

 108 



definition of instinct, 91 

 Paramcecium, behavior, 15, 35, 71 



chemotaxis, 21, 23-25, 27, 

 75, 76 



choice of food, 72 



effect of hunger on, 150 



electrotaxis, 59, 60 



forming groups, 24 



geotaxis, 29, 30 



interference of reactions, 140 



modifications of behavior, 76, 

 77, 140 



