El origen del hombre
Contrary to most attempts to solve this problem on the basis of “pure naturalism”, and specifically using biological methods, Orudzhev believes that the problem of the shift from animal nature to a qualitatively different nature – human nature – can only be solved through a philosophy that relies on results obtained not only through biology, but also through psychology, linguistics, sociology and other sciences. The problem must be formulated with attention being paid to the relevant intermediate links, which are not taken into consideration by individual sciences. Orudzhev believes that Darwin's theory still (almost 150 years since the 1871 publication of The Descent of Man, and Selection in Relation to Sex) cannot prove the natural origin of man in the proper sense, because it does not depart from “pure biologism” in its understanding of human nature.