Sleep & shelter; Hibernation 180 



Vocalization & communication 180 



Emotional expression 181 



Protective & aggressive activities 181 



Fear 181 



Behavior tendencies or temperament. ... 181 



MATURATION OF BEHAVIOR 182 



MOTIVATION OF BEHAVIOR 182 



MODIFIABILITY OF BEHAVIOR 



Conditioned reflexes 183 



Trial & error learning 183 



Discrimination learning 183 



Problem-box learning 184 



Serial or maze learning, &c 184 



Imitational learning 184 



INTELLIGENT BEHAVIOR ; INSIGHT ; 

 IDEATION 



Mnemonic capacities 185 



Ideational (symbolic) behavior 185 



Insightful behavior 186 



REPRODUCTIVE & SOCIAL BEHAVIOR 



Primary sex behavior 188 



Maternal & paternal behavior 188 



Social groups & socially significant be- 

 havior 189 



MISCELLANEOUS 



Hypnosis, catalepsy & Inactive states. . 190 



Psychopathology & unadaptive behavior 190 



OBSERVATIONAL PSYCHOBIOLOGY 



(Habits in nature & captivity) 



Pritnates in genera/ 191 



Pongidae & Hylobatidae 192 



The gorilla 193 



The chimpanzee 194 



The orang-outan 196 



Hylobates & Symphalangus 197 



Cercopithecidae 197 



Cebidae & Hapalidae 199 



Lemuroidea 200 



Tarsioidea 201 



MISCELLANEOUS 

 BIBLIOGRAPHIES 



Phylogeny of the primates 205 



Institutions for research & exhibition. . . 207 



Primate culture & methodology 208 



Conservation 209 



Primates in mythology & superstition; 



native legends, &c 209 



Primates in art 210 



APPENDIX: A KEY TO ABBREVIA- 

 TIONS NOT IN THE WORLD LIST OF 



SCIENTIFIC PERIODICALS 211 



INDEX OF AUTHORS 215 



[ xxvii 



