We wish to remark here how a small change of almost similar words serves as a defence of capitalism. Darwin spoke about the survival of the fittest, of those that are best fitted to the conditions. Seeing that in this struggle those that are better organized conquer the others, the conquerors were called the vigilant, and later the “best.” This expression was coined by Herbert Spencer. In thus winning on their field, the conquerors in the social struggle, the large capitalists, were proclaimed the best people. Haeckel retained and still upholds this conception. In 1892 he said, “Darwinism, or the theory of selection, is thoroughly aristocratic; it is based upon the survival of the best. The division of labor brought about by development causes an ever greater variation in character, an ever greater inequality among the individuals, in their activity, education and condition. The higher the advance of human culture, the greater the difference and gulf between the various classes existing. Communism and the demands put up by the Socialists in demanding an equality of conditions and activity is synonymous with going back to the primitive stages of barbarism.” The English philosopher Herbert Spencer already had a theory on social growth before Darwin. This was the bourgeois theory of individualism, based upon the struggle for existence. Later he brought this theory into close relation with Darwinism. “In the animal world,” he said, “the old, weak and sick are ever rooted out and only the strong and healthy survive. The struggle for existence serves therefore as a purification of the race, protecting it from deterioration. This is the happy effect of this struggle, for if this struggle should cease and each one were sure of procuring its existence without any struggle whatsoever, the race would necessarily deteriorate. The support given to the sick, weak and unfit causes a general race degeneration. If sympathy, finding its expressions in charity, goes beyond its reasonable bounds, it misses its object; instead of diminishing, it increases the suffering for the new generations. The good effect of the struggle for existence can best be seen in wild animals. They are all strong and healthy because they had to undergo thousands of dangers wherein all those that were not qualified had to perish. Among men and domestic animals sickness and weakness are so general because the sick and weak are preserved. Socialism, having as its aim to abolish the struggle for existence in the human world, will necessarily bring about an ever growing mental and physical deterioration.”