Abstract

The most distinctive feature of the third period of the history of science is the essential role of the inter-disciplinary investigations which represent a specific form of manifestation of the integrative tendency in the history of science. The result was a cardinal re-organization of the system of science: together with the further development of the canonical sciences, such as mathematics, physics, chemistry, biology, etc. as well as of their branches of various degrees. What also took place is a pro-cess of formation of complex theories, or even of complex sciences, involving in a new synthesis problems of various canonical sciences. They became rel-evant problems of philosophy of science. This process of peculiar solution of the philosophical problems in different complex fields of investigation resulted into disintegration of the united system of philosophy into various fragments, seen in a close connection with relevant problems from special sciences. This tendencies lead to different forms of positivistic philosophy.This disintegration of the system of philosophy is not a rough rejection of the united system of philosophy of science, nor does it represent the united positivism.