FIG. 2ti. THE FECARI, OR SJUTH AMERICAN HOU. 



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. 

 Researches 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. 1 4. Consequences of defining their 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 catch in gin sects. 

 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. 



LARDNER'S MUSEUM OP SCIENCE. i 113 



No. 96. 



