LITMIR.BIZ

      From the very graduating the Main Pedagogical Institute, teaching took a considerable time of Dmitry Ivanovich Mendeleyev. Teacher’s work of the scientist amazes by its breadth. At first, together with general, theoretical, organic and analytical chemistry he was teaching physics and physical geography. Students not just loved the scientist, they literally worshipped him. His appearance also made a great impression. He had never delivered his lectures smoothly, but always vividly, interestingly and informally, accompanying his words with an expressive mimicry. It was difficult to take exams to him.

      Dmitry Ivanovich was teaching at the University, the Institute of Technology, the Institute of the Corps of Engineers of Communications, at the Nicholas Engineering Academy, the Nicholas Engineering School and at the 2^nd Military School. Since 1871 he had been teaching chemistry at the Higher Female Courses. Later the number of the educational institutions, where Mendeleyev had been teaching, slightly reduced and he concentrated all his work mainly at the Institute of Technology and at the University.

      Mendeleyev wasn’t only teaching but he always took part in the public life of the educational institutions, quickly reacting to the changes, which had been made in the system of Russian education. The liberal reforms of the 1860’s, which had been made by Alexander II, applied to the system of education in Russia and influenced the life of the University immediately. The statute of the University, signed by Alexander II on June, 18^th of 1863, was the most liberal university regulation in Russia of the 19^th – the beginning of the 20^th century. The statute gave autonomy to the higher educational institution. The University’s board, the members of which were all the professors, became an independent institution. The Board had the right to choose the rector, pro-rector, deans and also professors for the vacant chairs. It was very important that the University’s board got an opportunity to divide the faculties to the branches, to join and to divide the chairs, to change them and to define which subjects should have been considered obligatory and not obligatory for students.

      Having become in 1867 the head of the department of general chemistry of the physico-mathematical faculty, Mendeleyev succeeded to separate out an independent course of analytical chemistry, which had been taught by N. A. Menshutkin. Thanks to Mendeleyev’s initiative, A. M. Butlerov was invited to teach the course of organic chemistry from Kazan University in 1868. And since 1869 the chemical sciences were represented at the University by the three departments: of general and inorganic chemistry (D. I. Mendeleyev), of organic chemistry (A. M. Butlerov) and of analytical and technical chemistry (N. A. Menshutkin).

      According to the Statute of 1863 the University got the right to establish scientific societies. Thus, Saint-Petersburg Society of Naturalists (1868), the Philological Society (1869) and the Physical Society (1872) appeared.

      During these years D. I. Mendeleyev took an active part in the establishment of the scientific chemical society. There are notes in the diaries of the scientist of 1861–1862 about the meetings of the chemists which had become regular. At those meetings there were the majority of well-known chemists and representatives of the adjoining sciences, who worked in Saint-Petersburg. N. N. Zinin, F. F. Beilstein, L. N. Shishkov, A. A. Voskresensky, N. I. Koksharov, E. H. Lenz, B. S. Jacobi, etc. can be mentioned among them. It becomes clear from the diaries to what a great extent was the role of Mendeleyev in the establishment of the scientific chemical society. However, the dream of the scientist was realized only in 1868.

      The work at the manual “The fundamentals of chemistry” takes an exclusive place in the life and activities of Dmitry Ivanovich Mendeleyev at the end of the 1860’s. Right this work led the scientist to the discovery of the periodical law of chemical elements. Mendeleyev must have started to work at the text of the manual in winter of 1867–1868, using in the process of the work the stenograms of his lectures, made by the students. The book was published in separate editions, the first of which appeared at the end of May – beginning of June of 1868. Later Dmitry Ivanovich admitted that “The Fundamentals…” was his “dear child.”

      During the process of the work at the schedule of the editions of the 2^nd part Mendeleyev was gradually coming from grouping the elements according to their valency to their location according to the resemblance of their characteristics and atomic weight. In the middle of February of 1869 Mendeleyev, while keeping thinking over the structure of the subsequent chapters of the book, reached in real earnest the problem of creating the rational system of chemical elements. The determining stage came on February, 17^th.

      Anna Ivanovna Mendeleyeva (nee Popova; 1860–1942) – the second wife of D. I. Mendeleyev. Late 1870’s

      Portrait of D. I. Mendeleyev made by A. I. Mendeleyeva. Oil, 1886

      D. I. Mendeleyev. 1861

      The memorial study of D. I. Mendeleyev. Restored and opened for visitors in December of 1911. (now the D. I. Mendeleyev Museum and Archives attached to SPbSU)

      The desktop of D. I. Mendeleyev in his study at the University

      D. I. Mendeleyev (in the centre) among the professors, lecturers and students of the physico-mathematical faculty of Saint-Petersburg University. 1875

      The manuscript of the table “The experience of the system of elements, based on their atomic weight and chemical resemblance.” February, 17 ^th of 1869

      Saint-Petersburg University in the latter half of the 19^th century. Water-colour by N. B. Belyavsky after the old engraving. Here D. I. Mendeleyev had been studying at the Main Pedagogical Institute (1850–1855), teaching (1857–1890) and living (1866–1890)

      The scientist had been working when in the morning he was given a letter with the information about the supposed urgent trip to Tverskaya province. After having read the letter rapidly, he put the letter aside and kept comparing the different variants of comparing the elements of the natural groups according to their atomic weights. The papers cut into cards finished. A group of columns and lines, which became the starting point of the development of the table “The experience of the system of elements, based on their atomic weights and chemical resemblance”, appeared on the back side of the received letter. During the day Mendeleyev was working over the compilation of “The experience of the system of elements…” In the evening he sent a clean copy of the table to the press having made the notes for the typesetters and having written the date “February, 17^th of 1869.”

      There is a version that Mendeleyev saw “the system of elements” in his dream. He got up from a joyful excitement and wrote rapidly the table on a piece of paper. That’s all. The scientist compiled a clear and harmonious building of the periodical system from the chaos of separate indigested chemical elements.

      Dmitry Ivanovich utterly disliked talking with the strangers “about personal, subjective part of his feelings, about the preparatory period, when the ideas had been formulating and confidence that he had reached the one of the deepest mysteries of nature had been composed little by little.” However, according to the testimonies of Ivan, his son in a second marriage, the scientist used to say that the year of 1860 had become for him the “determinative moment” in the establishment of the periodical system – the congress of chemists in Carlsruhe. And more specifically – the ideas expressed by Italian chemist S. Cannizzaro. D. I. Mendeleyev said, “I consider him to be my real forerunner, because the atomic weights defined by him gave me the necessary point of support.”

      In August of 1869, at the Second congress of Russian naturalists the scientist made a report “About the atomic volume of the simple substances”, where he offered a short form of the table. Only In, the rare earth elements and several heavy ones: Au, Hg, Te, Bi, Th, U, didn’t get any place

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