A great and far-reaching effect was produced in England at this time by the publication of such revolutionary works as Thomas Paine’s “Rights of Man” and Mary Wollstonecraft’s “Vindication of the Rights of Woman”; and looking back now, after the lapse of a hundred years, we can see that a still wider extension of the theory of rights was thenceforth inevitable. In fact, such a claim was anticipated--if only in bitter jest--by a contemporary writer, who furnishes us with a notable instance of how the mockery of one generation may become the reality of the next. There was published anonymously in 1792 a little volume entitled “A Vindication of the Rights of Brutes,”[3] a _reductio ad absurdum_ of Mary Wollstonecraft’s essay, written, as the author informs us, “to evince by demonstrative arguments the perfect equality of what is called the irrational species to the human.” The further opinion is expressed that “after those wonderful productions of Mr. Paine and Mrs. Wollstonecraft, such a theory as the present seems to be necessary.” It _was_ necessary; and a very short term of years sufficed to bring it into effect; indeed, the theory had already been put forward by several English pioneers of nineteenth-century humanitarianism. To Jeremy Bentham, in particular, belongs the high honour of first asserting the rights of animals with authority and persistence. “The legislator,” he wrote, “ought to interdict everything which may serve to lead to cruelty. The barbarous spectacles of gladiators no doubt contributed to give the Romans that ferocity which they displayed in their civil wars. A people accustomed to despise human life in their games could not be expected to respect it amid the fury of their passions. It is proper for the same reason to forbid every kind of cruelty towards animals, whether by way of amusement, or to gratify gluttony. Cock-fights, bull-baiting, hunting hares and foxes, fishing, and other amusements of the same kind, necessarily suppose either the absence of reflection or a fund of inhumanity, since they produce the most acute sufferings to sensible beings, and the most painful and lingering death of which we can form any idea. Why should the law refuse its protection to any sensitive being? The time will come when humanity will extend its mantle over everything which breathes. We have begun by attending to the condition of slaves; we shall finish by softening that of all the animals which assist our labours or supply our wants.”[4]