ВАЖНЫЙ МЕТОДОЛОГИЧЕСКИЙ ПРИНЦИП СОВРЕМЕННОЙ ФИЛОСОФИИ НАУКИ: ВЗАИМОСВЯЗЬ ИСТОРИИ НАУКИ И ФИЛОСОФИИ НАУКИ. It is revealed in the article that, having one and the same object(i.e. science), history of science and philosophy of science interact closely with each other, though they differ in the subject. The interaction is genetically conditioned and based on the permanent interaction between scince and philosophy. Hence, the assertion that there exists a holistic thinking comprising both history of science and philosophy of science can be deemed correct.