I see no logical nor spiritual escape from the theory that evolution (not, please observe, Natural Selection) involves a deliberate intentional destruction by the higher forms of life of the lower. It is a dangerous and difficult business; for in the course of natural selection the lower forms may have become necessary to the existence of the higher; and the gamekeeper shooting everything that could hurt his pheasants or their chicks may be behaving as foolishly as an Arab lunatic shooting horses and camels. But where Man comes, the megatherium must go as surely as where the poultry farmer comes the fox must go unless the hunt will pay for the fox’s depredations. To plead for the tiger, the wolf, and the poisonous snake, is as useless as to plead for the spirochete or the tetanus bacillus: we must frankly class these as early and disastrous experiments in creation, and accept it as part of the mission of the later and more successful experiments to recognize them as superseded, and to destroy them purposely. We should, no doubt, be very careful how we jump from the indisputable general law that the higher forms of life must exterminate or limit the lower, to the justification of any particular instance of the slaughter of non-human animals by men, or the slaughter of a low type of man by a high type of man. Still, when all due reservations are made, the fact remains that a war of extermination is being waged daily and necessarily by man against his rivals for possession of the earth, and that though an urban humanitarian and vegetarian who never has occasion to kill anything but a microbe may shudder at the callousness with which a farmer kills rats and rabbits and sparrows and moles and caterpillars and ladybirds and many more charming creatures, yet if he were in the farmer’s place he would have to do exactly the same, or perish.