CONTEXTS. 



The proportion of instinct to in- 

 telligence increases as we descend 

 in the organic chain. — 8. Opinions 

 of Descartes and Boffon — Charac- 

 ter of the dog. — 9. Reseaiclies 

 and observations of Frederic 

 CnTier. — 10. Causes of the errors 

 of Descartes, Bnfibn, Leroy, and 

 Condillac — 11. Degrees of intelli- 

 gence ohseired in different orders 

 of animals. — li. Accordance of 

 this with their cerebral derelop- 

 ment. — 13. Opposition between 

 intelligence and instinot. — 14. 

 Consequences of defining their 

 limits. — 15. Example of instinct 

 in ducklings. — 16. In the con- 

 stmction 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 ^nimnlfi , — 2i, 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 nm'Tnalg 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 

 aniTnalg — 32. Instdncts of migra- 

 tion. — 33. Irregular and occa- 

 sional migration. — 3i. General 

 assembly preparatory to migration. 

 — 35. Occasional migration of 

 monkeys. 



Chap. n. — 36. Migration of the 

 lemmings. — 37. Vast migration 

 of field-mice of Eamtschatka. — 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 

 e^s. — 43. Habitation constructed 

 by Liparis ehiysorrhea 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. 

 — J 7. Jfanceuvres of the gadffy to 

 get its eggs into the horse's sto- 

 mach. — is. , The ichneumon. — 49. 

 Its use in preventing the undue 

 multiplication of certain species. 

 — 50. Its form and habits. — 61. 

 The nourishment of its larvse. — 

 52. The sexton beetle.— 53. Their 

 processes in burying carcasses. — 

 54. Anecdote of them related by 

 Strauss. — 55. Singular anecdote 

 of the (jTmuopleurus 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 beetie related 

 by Gleditsch. — 60. Indications of 

 reason in this case. — 61. Anec- 

 dote of ants related by Keaumur. 

 — 62. Anecdote of ante related by 

 Dr. Franklin. — 63. Anecdote of 

 the bee related by Mr. Wailes. — 

 64. Anecdote of the humble bee 

 by Huber. — 65. Memory of insecte. 

 — 66. Secognition of home by the 

 bee. — 67. Singular conduct of the 

 queen. — 68. Bogers'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. — TS. Their oc- 

 casional association for predaceons 

 excursions.- — 79. Assemblies of 

 migratory animals. — SO. Example 

 of the migratory pigeons of Ameri- 

 ca.— 81. The beaver.— 82. Their 

 habitations. — 83. Process of build- 

 ing their villages. — 84. These acte 

 all instinctive. — 85. Low degree 

 of intelligence of the beaver. — 86. 

 Method of catching the animal. — 



