EN
Hellenistic science was centred in the city of Alexandria in Ptolemaic Egypt. It flourished there for three centuries. Many of works of its representatives were preserved to our times. These works show that predominant majority of the ancient scholars used observation and deductive reasoning exclusively to explain natural phenomena. They did not verify the theoretical conclusions of their reasoning by means of simple experiments. This approach caused that alongside with objective conclusions the works of ancient Greek scholars contain also many erroneous ones. The root of this approach lies in abstract tradition of Greek thinking and its distrust to experience coming out off sensory perceptions. In a modified form of a system of deductive logics, this approach was implanted into Hellenistic science through the authority of Aristotle. On the other hand we can find traces of experimental approach in the works of Pythagoras, Archimedes and Heron of Alexandria.