leads to a continuous development of natural organs; that is the foundation of the theory of descent, the essence of Darwinism. In men, it leads to a continuous development of tools, of the means of production. This, however, is the foundation of Marxism.
Here we see that Marxism and Darwinism are not two independent theories, each of which applies to its special domain, without having anything in common with the other. In reality, the same principle underlies both theories. They form one unit. The new course taken by men, the substitution of tools for natural organs, causes this fundamental principle to manifest itself differently in the two domains; that of the animal world to develop according to Darwinian principle, while among mankind the Marxian principle applies.
When men freed themselves from the animal world, the development of tools and productive methods, the division of labor and knowledge became the propelling force in social development. It is these that brought about the various systems, such as primitive communism, the peasant system, the beginnings of commodity production, feudalism, and now modern capitalism, and which bring us ever nearer to Socialism.
X. CAPITALISM AND SOCIALISM.
The particular form that the Darwinian struggle for existence assumes in development is determined by men's sociability and their use of tools. The struggle for existence, while it is still carried on among members of different groups, nevertheless ceases among
