Ever since the invention of the steam engine in the eighteenth century, men have reflected upon the profound transformations being wrought in their societies by what soon came to be called the Industrial Revolution. In their own fields, historians, economists, sociologists, military specialists, and Marxist philosophers have all traced the effects of industrialization, and some of them—particularly those interested in and aroused by war—have perceived the implications of these changes for international relations. Priority in this respect seems to belong to Auguste Comte, the founder of modern sociology, for devising the first analytical-historical model of the industrial society—one moreover that explicitly, though not always convincingly, pointed to the international repercussions of industrialism. In an essay first published in 1822, Comte drew a distinction betwelen two types (or models) of civilization: the Theological and Military, and the Scientific and Industrial (there also was a third, transitional—as he called it, “mongrel””type, the Metaphysical and Juridical). Comte's first model is notable for the predominance of military activities: “Society makes conquest its one permanent aim.” War makes it possible to found larger societies. In the transitional stage, he observed, “The two aims of activity, conquest and production, advance pari passu. Industry is at first favoured and protected as a military resource. Later its importance augments, and finally war is regarded and systematically pursued as a means of favouring industry.” But, in the last model, “industry has become predominant. All the special relations have gradually established themselves upon industrial bases. Society, taken collectively, tends to organize itself in the same manner,” renounces conquest and war, and makes production “its only and constant aim.”