FACULTIES ‘OF THE MIND. 947 
and preserve existence and its comforts under circumstances 
which, without it, would have been fatal to both. 
But while the useful properties of this appetite disap- 
pear, In many cases, in consequence of domestication, in 
several instances they remain and exhibit themselves even 
when not necessary to the comfortable existence of the indi- 
vidual. Thus the dog, even when well fed, will often con- 
ceal the remainder of the food he is unable at the time to 
consume, although the calls of hunger seldom urge him to 
return to the hidden stores. The fox, so similar to the dog 
in many particulars, exhibits, (as we have already stated 
with another view,) in a wild state, the same disposition. 
When he has obtained more food than is necessary for the 
supply of his present wants, he buries the remainder, and 
returns to it when again pressed by hunger, often after an 
interval of several days. Itis probable, that in a wild state, 
thedog obeys a similar instinct, of which, its appearance in 
a domesticated state is a strong proof. Even the love of hunt- 
ing, which prevails among our race, almost universally, seems 
to be the remains of one of the original instincts of the species. 
As intimately connected with this appetite, we may short- 
ly notice the peculiar manner in which each animal disposes 
of its excrementitious or secreted matters. How carefully do 
the otherwise filthy swine, even in a domesticated state, 
void in a corner, and preserve the cleanliness of their bed. 
Cats are careful to bury their dung, while dogs exonerate 
upon stones. ‘The uniformity of these peculiar modes of 
action in-each species, indicates instinctive arrangements 
for their production, which the fastidious observer may 
despise, but which the enlightened naturalist will not over- 
look. 
2. Appetite for Sleep—We have already, while treat- 
ang of the muscular and nervous systems, stated the neces- 
