174 COMPARATIVE ZOOLOGY. 
certain of the senses. Wherever it exists, there is a tissue 
containing a net-work of capillaries and the terminations 
of sensory nerves. In the Sea-anemone, Snail, and Insect, 
it is most acute in the 
“feelers” (tentacles, horns, 
and antennee) ;** in the Oys- 
ter, the edge of the mantle 
is most sensitive; in Fish- 
es, the lips; in Snakes, the 
tongue; in Birds, the beak 
and under side of the toes; 
in Quadrupeds, the lips and 
tongue; and in Monkeys 
Fre. 145.—Various Antenne. and Man, the lips and the 
tips of the tongue and fingers. In the most sensitive parts 
of Birds and Mammals, the true skin is raised up into 
multitudes of minute elevations, called papille@, contain- 
ing loops of capillaries and nerve-filaments. There is a 
correspondence between the delicacy of touch and the de- 
velopment of intelligence. The Cat and Dog are more 
sagacious than hoofed animals. The Elephant and Par- 
rot are remarkably intelligent, and are as celebrated for 
their tactual power. 
Taste is more refined than touch, since it gives a 
knowledge of properties which can not be felt. It is al- 
ways placed at the entrance to the 
digestive canal, as its chief purpose 
is to guide animals in their choice 
of food. No special organ of taste 
can be detected in the Invertebrates, 
“ Fra. 146.—Papille of Human 
although all seem to exercise a fac- Palm, X 35, the cuticle be- 
ulty in selecting their food. Even ™* fare 
in Fishes, Reptiles, and Birds this sense is very obtuse, 
for they bolt their food. But the higher animals: have it 
well developed. It is confined to the tongue, and is most 
