Klement Arkadyevich Timiryazev - our Motherland is proud of this name. The great scientist is widely known for his multifaceted creativity in various branches of biology and his ingenious solution to a number of the most difficult scientific problems. Timiryazev re-illuminated many positions in the organic world, indicating new paths that scientific thought should follow, thereby making a most valuable contribution to biological science. The path chosen by the scientist, the path of close connection between science and practice, turned out to be the only correct one in understanding the patterns in the development of living nature . But, unfortunately, in our time, the works of K. A. Timiryazev are not republished, they are almost not remembered, and if they are remembered, then only when visitors visit the Memorial Museum-Apartment of K. A. Timiryazev and the Biological Museum, which bears the name of the scientist, and even when they see, driving or running past, a monument at the Nikitsky Gate, or the building of the Timiryazev Agricultural Academy. In the book about K. A. Timiryazev, the authors only touch on his life path, leaving the opportunity for interested readers to delve into his biography themselves and find many interesting and useful facts there for themselves. The publishing layout is saved in a4.pdf format.