In the Outline of Morphology, he wrote: "The difference between higher people and lower people is greater than that between lower people and higher animals." In Forever, he put it more bluntly: "Every well-educated German soldier ... has higher wisdom and moral value than hundreds of primitive natural people that Britain, France, Russia and Italy can provide." This undoubtedly gives great inspiration to German eugenics theory. 1905, haeckel himself joined the eugenics society.