Doctor Moreau explains.
does this thing called pain occur. But the laws we feel our way towards— Why, even on this earth, even among living things, what pain is there?”
As he spoke he drew a little penknife from his pocket, opened the smaller blade, and moved his chair so that I could see his thigh. Then, choosing the place deliberately, he drove the blade into his leg and withdrew it.
“No doubt,” he said, “you have seen that before. It does not hurt a pin-prick. But what does it show? The capacity for pain is not needed in the muscle, and it is not placed there,—is but little needed in the skin, and only here and there over the thigh is a spot capable of feeling pain. Pain is simply our intrinsic medical adviser to warn us and stimulate us. Not all living flesh is painful; nor is all nerve, not even all sensory nerve. There’s no tint of pain, real pain, in the sensations of the optic nerve. If you wound the optic nerve, you merely see flashes of light,—just as disease of the auditory nerve merely means a humming in our ears. Plants do not feel pain, nor the lower animals; it’s possible that such animals
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