CONTENTS* OF VOL. it. 



Page- 

 Periodical Migration. Summer birds of passage. Win- 

 ter birds of passage. Places whence they come 

 and to which they return. Polar and Equatorial 

 migration. Influenced by the zones of equal tem- 

 perature, .... . . 29 



Torpidity. In Quadrupeds, confined to the unguicu- 

 lata. Retire to a place of safety. Assume the po- 

 sition of sleep. Are very fat. Suffer, when torpid, 

 a diminution of temperature. Respiration slow. 

 Circulation slow. Diminished irritability. Power 

 of digestion weak. Weight diminishes. Causes of 

 torpidity, a reduced temperature, confined atmos- 

 phere, state of the constitution. Reviviscence. Tor- 

 pidity of birds. Submersion of swallows, Torpi- 

 dity of cold-blooded animals. Quiescence, . 45 



2. Food. Provisions against the occurrence of want 



at particular seasons. Migration. Storing, . 81 



3. Situation. Land and water, Amphibious, . 84 

 4-. Foes. Rapacious animals. Man, . . 87 



Revolutions which have taken place in the Animal 

 Kingdom. 



Remains of animals found in rocks. Errors, their ori- 

 gin. No evidence that these remains have been 

 brought from other countries. Laws influencing 

 Geographical distribution have always operated. 

 The oldest relics not always belonging to the sim- 

 plest animals, ....... 8S 



Origin of these revolutions. Influence of the chace. 

 Detrition of mountains, and upfilling of lakes. In- 

 crease of dry land. Changes of temperature. Pe- 

 culiar co-existing characters of the state of the stra- 

 ta, and the kind of putrefactions which they con- 

 tain, . 97 



