LECTURE V. 



SOME MANIFESTATIONS OF HIGHER INSTINCT.— 

 RELATION OF INSTINCT TO SPECIAL STRUCT- 

 URE AND FUNCTION. 



Relation of the Appetites to the Instincts. — Perfection of the work no 

 proof of Intelligence in the Actor. — Test of Intelligence. — Flexi- 

 bility of Instinct. — The Anipelopsis. — The Bean. — The Potato. — 

 The Kno2vledge of Enemies among Foxvls. — Common defence. — 

 Simulation of death. — Instinct and Clitnatic change. — The Musk- 

 rat. — The Partridge. — Instincts learned from observation alone. 

 — Ijtstincts essential to life. — Origin of instinctive powers. — Hi- 

 bernation. — Difficulties of the Natural Selection Theory. — Special 

 Structures. — The Rattle-snake, Bee, Wasp and Hornet. — Rela^ 

 tion of Instinct to color and form. — Cases cited from Wallace. — 

 Relation of Instinct to Experience. — Seventeen-year Locusts. 



We have thus far treated of Instinct chiefly as sup- 

 plementing structure and function of organs, either 

 directly or indirectly. There is a certain function 

 of the stomach that produces the sensation of hun- 

 ger. Instinct takes up the work and allays this 

 craving by supplying the materials that satisfy it, — 

 and the materials that satisfy it in each animal are 

 the materials fitted to prolong his life and build 

 up the body. This chain of means is complete. 

 The links all join together — they are links of physi- 

 cal necessity, if the animal kingdom is to be kept on 

 this globe. In hundreds of kinds of animals they are 



