[On the formation of Soviet haematology as an independent scientific clinical discipline and medical profession].

On the basis of a critical analysis of sources and the use of comparative historical research method, the authors reveal the fundamental role of Academician of the USSR Academy of Sciences I.A. Kassirsky in the formation of haematology as an independent clinical discipline in the USSR and put forward the thesis of the decisive importance in this process of the unified haematological school of A.N. Kryukov - I.A. Kassirsky.