FACULTIES OF THE MIND. 245 



sigh, which intimated his experience of its effects, call it 

 deathen. 



In general, when animals have obtained a supply of food, 

 they satisfy the cravings of appetite and retire. In other 

 cases, the superfluous food of to-day is concealed to pro- 

 vide for the cravings of the morrow; or still more ex- 

 tensive arrangements are exhibited, in which the bounties 

 of harvest are laid up in store against the scarcity of pro- 

 vision in winter. 



In the other features of this appetite* there is a much 

 greater variety of character. Thefrequency of the calls of 

 hunger, varies according to the species or the habits of the 

 individual. Thus, the caterpillar eats almost constantly, j 

 while the butterfly produced from it, scarcely ever seeks 

 after nourishment. In almost all animals, however, there 

 are stated intervals, during which the calls of hunger are 

 felt, distinguished by a restlessness, or by the emission of 

 particular sounds. 



These particular periods when the calls of hunger are 

 felt, appear in like manner to follow no general rule with 

 regard to the species or even classes of animals. Some 

 feed only during the day, and are termed diurnal, as near- 

 ly all the ruminating quadrupeds and land birds ; others 

 feed only in the twilight, as the bats and owls, and are called 

 crepuscular ; while many beasts of prey, aquatic birds, and 

 others, prefer the darkness of the night, and are termed 

 nocturnal. 



The predilections of this appetite are equally anomalous : 

 Some quadrupeds and birds preferring vegetable, others 

 animal matter ; either in a fresh, a dried, or a putrid state. 

 Some species feed on animals and vegetables only while 

 these are living, others only while dead. 



In the manner of obtaining food, this instinct, in diffe- 

 rent animals, acts in various ways. The spider weaves his 



