Russo claims that our picture of the so called Alexandrian science is wrong. In the 3rd and 2nd century B.C. in Alexandria scientific researches in contemporary meaning of the word were conducted, but almost all books written by hellenistic scientists were lost. The received picture is shaped by books written in the period of Roman Empire by creativeless commentators. In author's opinion Russo's claim is not suitably justified. He applies his own demarcation criterion: what decides of the scientific character of a cognitive enterprise is the systematicity of theoretical investigation and of experimental researches. The appraisal he is arriving at is that in the 3rd and 2nd century B.C. ideas of great (scientific) potential were created but they were not applied in the systematic way because social conditions were not propitious enough.