Спутник жизни и науки: о дневниках Н.Н. Платоновой
The review analyzes the diary of Nadezhda Nikolaevna Platonova (1861–1928), published in 2020. There are given the archeographic characteristics of the publication. There is also estimated the information potential of the diary. In particular the diary is considered as the evidence of the professorial life of the late XIX – early XX centuries. There is paid special attention to the analysis of communicative interactions as school-forming practices of St. Petersburg historians. Then the review represented the role of N.N. Platonova in the academic activity of her husband – historian Sergey Fedorovich Platonov (1860–1933). The final part presents the prospects for researching the dissertation culture through the diary of N.N. Platonova.