The acceptance of Darwinism in Spain, as Thomas F. Glick has observed, is clearly associated with the 1868 Revolution and the scientific institutions created after it.¹ Moreover, during the six-year period of Democracy an event of great importance occurred: in 1869-70 part of the Spanish working-class movement broke tactically with Federal Republicanism, and Bakuninist Anarchism appeared on the scene.² However, it is not really possible to speak of significant acceptance of Darwinism within Spanish anarchism at this time. We need to wait, rather until the 1880s, from which moment it would be fair to say that anarchists were also Darwinists.³