The correlation of the numbers of the most and the least mass branches Increased from 95 In 1950 to 400 In 1974. The three most mass branches today (technical, physico-mathematical and economic science) Increased considerably faster than the scientific personnel proper. The physlco•mathematlcal sciences went from the 6th place by the number of scientific workers to 26-l. the 2nd, and the economic science -from the 10th to the 3rd. The priority of these branches In personnel reinforcement of science revealed to a great extent th~ process of Its transformation Into a direct productivity force, maintaining acceleration of scientific-technical progress on the basis of elaborating and Introducing new machinery and technologies, and raising the economic substantiation of production In all Its areas. NATURE OF SHIFTS As Indicated by statistical data, furnished by the USSR Central Statistical Department, the quantitative changes In the professional structure occur quite Intensively. Local qualita­ tive shifts are not so dynamic but their accounting Is of no less significance for controlling the training and utilization of the scientific and scientific-pedagogical personnel. Changes of this type occur In three directions associated with: 1) the appearance of new areas of research, which become the base for the formation of new scientific professions; 2} differentiation of scientific professions, specified by the continuous expansion of the subject areas and the-Increase of personnel with the development of research; 3} Integration of professions, establishment of new subject and methodological ties between them. Consequently, as the sciences and requirements of the higher educational Institutions and the national economy develop. the nomenclature of professions Is subjected to periodic review. In recent years professions associated with the study of the plasma. radiochemistry, the creation of robots and manipulators. oceanic geology, al lerglology and Immunology. etc. have been Introduced In the nomenclature of professions. MOBILITY AMONG DISCIPLINES 
**Analysis**
The text discusses the changes in the professional structure of scientists and scientific personnel in the USSR, specifically highlighting the growth of certain fields such as physico-mathematical sciences and economic science. It also mentions the emergence of new scientific professions and the need for periodic review of the nomenclature of professions. This suggests that the text is focused on the development of science and technology, and its impact on the economy and society.

**Category**
Science and technology, Education, Employment