In 1789, Jeremy Bentham wrote:
The day may come when the rest of the animal creation may acquire those rights which never could have been withholden from them but by the hand of tyranny. The French have already discovered that the blackness of the skin is no reason why a human being should be abandoned without redress to the caprice of a tormentor. It may one day come to be recognized that the number of the legs, the villosity of the skin, or the termination of the os sacrum are reasons equally insufficient for abandoning a sensitive being to the same fate. What else is it that should trace the insuperable line? Is it the faculty of reason, or perhaps the faculty of discourse? But a full-grown horse or dog is beyond comparison a more rational, as well as a more conversable animal, than an infant of a day or a week, or even of a month, old. But suppose they were otherwise, what would it avail? The question is not, Can they reason? nor Can they talk? but Can they suffer?
From Introduction to the Principles of Morals and Legislation, Chapter 17, as quoted in Mary Midgley's Animals and Why They Matter (1983), Chapter 8.
Sunday, June 11, 2000 at 17:12:03 (EDT) = Datetag20000611