FACULTIES OF THE MIND. 913 
kind. This appears from the circumstance, that what is 
agreeable to and sought after by one animal, is often disa- 
greeable to another, and carefully avoided. 
e. From these considerations it appears to be difficult to 
determine the knowledge of external objects, possessed by 
any one species, from the developement of the organs of the 
senses. Nor does it appear that there is any regular con- 
nected gradation in the relative perfection of the senses, 
keeping pace with the increasing simplicity of bodily struc- 
ture. , 
JF Although many animals have some of the senses more 
fully developed than Man, comparative anatomy furnishes 
a demonstration, that there is no animal in which they all 
exist in so great a degree of perfection. Hence we are led 
to conclude, that man is more intimately acquainted with 
the properties of the material world in general, than any 
of the inferior animals. 
g- Some of the senses, such as taste, smell and touch, re- 
quire the existing object to be brought into contact with 
the organs; while in others, as sight, heat, and hearing, 
the sensation is produced by means of media. Touch, 
which is most universally distributed, appears to be the 
sense into which the others may be resolved. Thus, light 
comes in contact with the eye, heat with the skin, and the 
vibrating air with the ear. 
CHAP. XI. 
FACULTIES OF THE MIND. 
Ix treating of the organs of perception, we endeavoured 
to ascertain the functions of the six senses, and the kind of 
information concerning the objects around us, which they 
