VIG. 20. — THK PECAHI, OR SOUTH AMERICAN HUG. 



INSTINCT AND INTELLIGENCE. 



CHAPTEE I. 



Instinct defined. — 2. Independent of experience or practice. — 3. 

 Sometimes directed by appetite. — 4. A simple faculty independent 

 of memory. — .5. Instinctive distinguished from intelligent acts. — 

 6. Instinct and intelligence always co-exist. — 7. The proportion of 

 instinct to intelligence increases as "we descend in the organic chain. — 

 8. Opinions of Descartes and Buffon — Character of the dog. — 9. 

 Kesearches and observations of Frederic Cuvier. — 10. Causes of the 

 errors of Descartes, Buffon, Leroy, and Condillac. — 11. Degrees of 

 intelligence observed in different orders of animals. — 12. Accordance 

 of this with their cerebral development. — 13. Opposition between 

 intelligence and instinct. — 14. Consequences of definingtheir limits. — 

 15. Example of instinct in ducklings. — 16. In the construction of 

 honeycomb. — 17. The snares of the ant-lion. — 18. Their mode of con- 

 struction and use. — 19. Spiders' nets. — 20. Fishes catching insects. — 

 21. Provident economy of the squirrel. — 22. Haymaking by the Siberian 

 lagomys." — 23. Habitations constructed by animals. — 24. The house 

 of the hamster. — 25. The habitation of the mygale, with its door. 

 — 26. Habitations of caterpillars. — 27. Clothing of the larva of the 

 moth. — 28. Dwellings of animals which are torpid at certain seasons. 

 — 29. The Alpine marmot — Curious structure of their habitations. — 

 30. Method of constructing them. — 31. Singular habits of these 

 animals. — 32. Instincts of migration. — 33. Irregular and occasional 

 migration. — 34. General assembly preparatory to migration. — 35. 

 Occasional migration of monkeys. 



Lakdheb's Musedm of Soiexce. I 113 



Xo. 96. 



