Only decisive repudiation of the idea of fixed species, only the study of the history of the evolution of plants and their anatomy, prepared the basis for a really scientific classification. Marx, who in distinction from Darwin was a conscious dialectician, discovered a basis for the scientific classification of human societies in the development of their productive forces and the structure of the relations of ownership which constitute the anatomy of society. Marxism substituted for the vulgar descriptive classification of societies and states, which even up to now still flourishes in the universities, a materialistic dialectical classification. Only through using the method of Marx is it possible correctly to determine both the concept of a workers' state and the moment of its downfall. All this, as we see, contains nothing 'metaphysical' or 'scholastic', as conceited ignorance affirms.
Dialectical logic expresses the laws of motion in contemporary scientific thought.