In the life of Leonardo da Vinci there were legends. It was a mystery to contemporaries and still remains one of the most mysterious figures in the history of mankind. “As a well-spent day brings happy sleep, so a fruitful life brings satisfaction” to this principle the great Italian remained faithful to the end of his days. He believed that both science and art are the way of cognition and transformation of the world, and therefore he tried to understand the essence of all things around him - be it the structure of the human body, the flight of a bird, the origin of the rainbow or the theory of painting. The book publishes selected natural science works by Leonardo da Vinci and his "Treatise on Painting". Translation into Russian made by the largest scientists of the 20th century A. A. Huber and B. P. Dental .