[1] Haeckel, Evolution of Man, Vol. I. p. 20.
[2] Ibid., p. 21 et seq.
[3] Romanes, Jelly-Fish, Star-Fish, and Sea-Urchins, p. 16.
[4] Jelly-Fish, Star-Fish, and Sea-Urchins, p. 65 et seq.
CHAPTER I
THE SENSES IN THE LOWER ANIMALS
I am inclined to believe that the primal, fundamental sense,—the sense of touch,—from which all the other senses have been evolved or developed, has been in existence almost as long as life.
It is quite probable that it is to be found in the very lowest animal organisms; and, if our own senses were acute enough, it is more than probable that we would be able to demonstrate its presence, beyond peradventure, in such organisms.