SIXTEENTH LECTURE. 



ANIMAL BEHAVIOR. 



C. O. WHITMAN. 



. 



" Natura non facit saltum, is applicable to instincts as well as to corporeal structure.' 

 DARWIN, Origin of Species, p. 231. 



CONTENTS. PAGE 



INTRODUCTORY 286 



BEHAVIOR OF CLEPSINE 287 



a. Deceptive Quiet 287 



b. Rolling into a Ball 289 



1. Provoked by Exposure 289 



2. Forced by Attack 290 



3. Induced by Gorging Blood 290 



4. Origin and Utility 290 



c. Sensitiveness to Light 293 



INSTINCT OF ROLLING INTO A BALL AMONG INSECTS 293 



BEHAVIOR OF NECTURUS 295 



a. Refusal of Food from Fear 295 



b. Behavior of Young in Taking Food 296 



c. Influence of Innate Timidity 298 



d. Organization Shapes Behavior 298 



e. Origin and Meaning of Behavior 299 



f. Sensibility Sources of Error 300 



g. Orientation through the Dermal Sensillae 302 



h. Origin and Nature of the Behavior in Taking Food 304 



1. Some Intelligence Implied 304 



2. Orientation Learned by Experience 305 



3. Deferred Instinct 305 



4. Pause before the Bait 306 



5. Meaning and General Occurrence 308 



6. Part Played by Fear : 309 



285 



