The ultimate fact in economics is that Nature only yields commodities as the result of labor. The necessity of SOME labor for the satisfaction of our wants is not imposed by political systems or by the exploitation of the working classes; it is due to physical laws, which the reformer, like everyone else, must admit and study. Before any optimistic economic project can be accepted as feasible, we must examine whether the physical conditions of production impose an unalterable veto, or whether they are capable of being sufficiently modified by science and organization. Two connected doctrines must be considered in examining this question: First, Malthus' doctrine of population; and second, the vaguer, but very prevalent, view that any surplus above the bare necessaries of life can only be produced if most men work long hours at monotonous or painful tasks, leaving little leisure for a civilized existence or rational enjoyment. I do not believe that either of these obstacles to optimism will survive a close scrutiny. The possibility of technical improvement in the methods of production is, I believe, so great that, at any rate for centuries to come, there will be no inevitable barrier to progress in the general well-being by the simultaneous increase of commodities and diminution of hours of labor. This subject has been specially studied by Kropotkin, who, whatever may be thought of his general theories of politics, is remarkably instructive, concrete and convincing in all that he says about the possibilities of agriculture. Socialists and Anarchists in the main are products of industrial life, and few among them have any practical knowledge on the subject of food production. But Kropotkin is an exception. His two books, ``The Conquest of Bread'' and ``Fields, Factories and Workshops,'' are very full of detailed information, and, even making great allowances for an optimistic bias, I do not think it can be denied that they demonstrate possibilities in which few of us would otherwise have believed.