CONTENTS. 



The proportion of instinct to in- 

 telligence increases as we descend 

 in the organic chain. 8. Opinions 

 of Descartes and Buffon Charac- 

 ter of the dog. 9. Researches 

 and observations of Frederic 

 Cuvier. 10. Causes of the errors 

 of Descartes, Buffon, Leroy, and 

 Condillac. 11. Degrees of intelli- 

 gence observed in different orders 

 of animals. 12. Accordance of 

 this with their cerebral develop- 

 ment. 13. Opposition between 

 intelligence and instinct. 14. 

 Consequences of defining their 

 limits. 15. Example of instinct 

 in ducklings. 16. In the con- 

 struction of honeycomb. 17. The 

 snares of the ant-lion. 18. Their 

 mode of construction and use. 

 19. Spiders' nets. 20. Fishes 

 catching insects. 21. Provident 

 economy of the squirrel. 22. 

 Haymaking by the Siberian lago- 

 mys. 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. 

 81. Singular habits of these 

 animals. 32. Instincts of migra- 

 tion. 33. Irregular and occa- 

 sional migration. 34. General 

 assembly preparatory to migration. 

 35. Occasional migration of 

 monkeys. 



CHAP. II. 36. Migration of the 

 lemmings. 37. Vast migration 

 of field-mice of Kamtschatka. 38. 

 Instincts conservative of species 

 stronger than those conservative 

 of individuals. 39-40. Instincts 

 of insects for the preservation of 

 their posthumous offspring. 41- 

 42. Transformations of insects 

 Precautions in the depositions of 

 eggs. 43. Habitation constructed 

 by Liparis chrysorrhea for its 



young. 44. Examples mentioned 

 by Keaumur and Degeer. 45. 

 Expedients for the exclusion of 

 light from the young. 46. Exam- 

 ple of the common white butterfly. 

 47. Manceiivres of the gadfly to 

 get its eggs into the horse's sto- 

 mach. 48. The ichneumon. 49. 

 Its use in preventing the undue 

 multiplication of certain species. 

 50. Its form and habits. 51. 

 The nourishment of its larvae. 

 52. The sexton beetle. 53. Their 

 processes in burying carcasses. 

 54. Anecdote of them related by 

 Strauss. 55. Singular anecdote 

 of the Gymnopleurus pilularius. 

 56. Such acts indicate reasoning. 

 57. Anecdote of a sphex told 

 by Darwin. 58. Indications of 

 intelligence in this case. 59. 

 Anecdote of a sexton beetle related 

 by Grleditsch. 60. Indications of 

 reason in this case. 61. Anec- 

 dote of ants related by Reaumur. 

 62. Anecdote of ants related by 

 Dr. Franklin. 63. Anecdote of 

 the bee related by Mr. Wailes. 

 64. Anecdote of the humble bee 

 by Huber. 65. Memory of insects. 

 66. Recognition of home by the 

 bee. 67. Singular conduct of the 

 queen. 68. Rogers' s lines on this 

 subject. 69. Error of the poet. 

 70. Anecdote of bees by Mr. 

 Stickney. 71. Instinct of thepom- 

 pilides. 72. The carpenter bee. 

 CHAP III. 73. Habitations for the 

 young provided more frequently 

 than for the adults. 74. Birds' 

 nests. 75. Nest of the baya. 



76. Nest of the Sylvia sutoria. 



77. Anti-social instinct of car- 

 nivorous animals. 78. Their oc- 

 casional association for predaceous 

 excursions. 79. Assemblies of 

 migratory animals. 80. Example 

 of the migratory pigeons of Ameri- 

 ca. 81. The beaver. 82. Their 

 habitations. 83. Process of build- 

 ing their villages. 84. These acts 

 all instinctive. 85. Low degree 

 of intelligence of the beaver. 86. 

 Method of catching the animal. 



