114 
ANATOMY AND PHYSIOLOGY 
brain, the particulars of which are given with the de- 
scription of the skeleton . 
OF THE SENSE OF TOUCH. 
“ The cutis in this tribe,” says Hunter, “ appears in 
general particularly well calculated for sensation, the 
whole surface being covered with villi, which are so 
many vessels, and we must suppose nerves. Whether 
this structure is only necessary for acute sensation, or 
whether it is necessary for common sensation where the 
cuticle is thick and consisting of many layers, I do not 
know. We may observe that where it is necessary the 
sense of touch should be accurate, the villi are usually 
thick and long, which probably is necessary, because in 
most parts of the body where the more acute sensations 
of touch are required, such parts are covered by a thick 
cuticle, of this the ends of our fingers, toes, and the 
foot of the hoofed animals are remarkable examples. 
Whether this sense is more acute in water, I am not 
certain, but should imagine it is.” 
OF THE EAR. 
“ This organ consists of the same parts as in the quad- 
ruped, an external opening, with membrani tympani, 
an Eustachian tube, a tympanum with its processes, and 
the small bones. There is no external projection form- 
ing a funnel ; we can easily assign a reason why there 
should be no projecting ear, as it would interfere with 
progressive motion, but the reason why it is not formed 
as in birds is not so evident. The external opening 
