230 PHILOSOPHY OF ZOOLOGY. 
intervals, measure the distance they ought to travel, and 
return with regularity to their home. ‘The sun appears to 
be their great regulator, as they are influenced by the 
changes which take place with his light and heat. Fishes, 
and other animals which live in the sea, or search for food 
on its shores, appear to regulate themselves by the motions 
of the tide. The regularity of the crowing of the cock has 
been long admired,—but it appears difficult to point out 
the measure of time by which it is governed. 
Man alone has devised artificial plans for measuring 
time,—in the employment of dials, clepsydree, sand- Been, 
clocks and watches. 
By attending to the succession of past events, and find- 
ing our anticipations frequently realised, we begin to form 
some notions with regard to futurity, and by imagining a 
continued succession, we acquire our ideas of eternity, if 
we can be said to have any distmet ideas on the subject. 
The notions of future time, in all probability, exist 
wherever there are notions of past time, and bear a co- 
ordinate degree of distinctness. In this respect, man is 
unquestionably superior to the brutes, as he exercises 
himself more frequently in measuring time, and devises 
more complicated plans for his future comfort. But the 
brutes are not ignorant of future time, as many of their ac- 
tions clearly testify, in the prospective efforts of their 1ma- 
gination, already noticed. A fox or a dog possessed ‘of 
more food than is necessary for the supply of present wants, 
conceals the remainder until again urged by the calls of hun- 
ger. The ermine will conceal a number of eggs in a par- 
ticular place, and return at intervals to its magazine. 
3. Power.—Were we merely mactive spectators of the 
changes which take place in the world, it is probable that 
the ideas of reflection which would result from the con- 
