Translation from Ancient Greek and note M. E. Sergeyenko; Editorial Board and . and . Fat and B. K. Shishkina . Natural science heritage of the "father of botany" . This book presents a translation of the nine books of Studies on Plants by the ancient Greek scientist Theophrastus (c. 370 - ok. 287 BC. e. ) and extensive comments on them. This work, written about 2300 years ago, was rightly valued in antiquity as unsurpassed by anyone. This is also evidenced by the fact that it was first published in 1495-1498, at the dawn of printing. Since then, it has been repeatedly reprinted, translated into various languages, including Latin, and extensively commented on since the XVI century, and the value of these comments increased as the knowledge of the flora of Greece and the Mediterranean countries increased. It is important to note that Theophrastus refers not only to plants grown or cultivated in the Mediterranean Sea region, but also tropical plants, which became known in Greece after the campaign to India by Alexander the Great (327 g.). before n. e. ). "Plant research" gives us an idea not only of the amount of plant knowledge more than 300 years before our era. It directly introduces us to the world of Hellenic science in the era of Aristotle and Plato. shows the methods of observation and ways of scientific presentation of one of the most talented students of Stagirita . Theophrastus' work will be of interest not only to botanists, but also to those engaged in the history of science, since the very advantages and disadvantages of the author's observation and thinking in the historical perspective have their value, showing us the state of knowledge about the nature of ancient Hellas. An essay on Theophrastus can be read in the book of Louis Figier Light of Science from antiquity to the present day. The great scientists of antiquity .