Public excitement of the first years of the reign of Alexander II was followed by the rise of a variety of folk studies. Kotlyarevsky was fascinated by the movement and from college worked for many different industries, "the old folk". He was nominated for significantly among the young, when the unfortunate accident led, in 1862, to his arrest; several months of detention greatly upset his health, and, in addition, on the arrest of "political" case subsequently impeded teaching for him. Having freedom in 1863, he took an active part in the foundation of the Moscow Archaeological Society (1864) and his first enterprises. At the beginning of 1867 Kotlyarevsky was invited to occupy the chair of Slavic and Russian philology in Dorpat. In the middle of 1868 he defended his thesis "On the burial customs of the pagan Slavs", to attract a lot of attention in the scientific world. In Dorpat, he did not stay long; since the end of 1869 began to show signs of the disease that has since left him. In 1872 he went abroad, lived in a warm climate, Italian, recovered, then fell ill again. Most of the foreign guests spent in Prague where, printed works: "The book is about the antiquities and history of the Pomeranian Slavs in the XII century," "Legends of Ottone Bamberg against Slavic history and antiquity" (Prague, 1874) and "Antiquities of the rights of the Baltic Slavs "(ibid, 1874). One of these books was his doctoral dissertation, which he defended in St. Petersburg in 1874, with a rather stormy argument with VI Lamanskii. Invite them to take the chair was made in Kiev, but it was again hindered by the fact that the former permit limited his teaching professorship one Dorpat. Finally, His Majesty`s orders, the prohibition was lifted, and at the end of 1875 Kotlyarevsky settled in Kiev. For several years he was here for courses in various departments of the "Encyclopedia of Slavic Studies"; participated in the works of the "Society of Nestor the chronicler," he was elected president; He was also chairman of the Slav Committee, at a time when society was brought South Slav affairs and went on movement of volunteers in Serbia; He lectured in Kiev for Women; he worked on the publication of the works of MA Maksimovic: I prepared and published in Voronezh "Philological Notes" (and, separately, in numbered copies) wonderful "Bibliographic Essay on ancient Russian literature" (Voronezh, 1881; general historical review, the history of studying the Old Slavonic and Old Russian language and writing). In 1881, he, at the request of doctors who went abroad and died in Pisa. Kotlyarevsky - an outstanding representative of the period in the development of Russian science, which followed the first works of our Slavonic and influences Grimm in the study of our national antiquities: in Slavic studies, he was a pupil Bodyansky, but soon became independent, in the study of folk poetry - pupil Buslaeva from which took effect Grimmovoy school, remaining, however, free from extreme passions, which fell in the other followers of this school, for example, Afanasiev & Op. Miller. His first works were caused by the need to establish those methods of investigation that brought a new school, which was not strictly observed by enough in the environment of professionals, and eliminate much of the science that has enjoyed the reputation in terms of walking. That was his book: "the old folk" (1862); these were later its special debriefings "Poetic views on the nature of the Slavs" Afanasyev, "History of Russian life" Zabelin and others. He was instrumental in the new direction of historical and literary study, to expand the area of ??the historical monitoring data history of social, national poetic creativity. The base of the Archaeological Society in Moscow for some time sent his interests mainly in archeology. At this time, was written his book "On the burial customs," which can serve as a specimen of his research methods: the study involved a wide variety of sources - the language, the traditions preserved chronicle various Slavic peoples, legends, modern, represent an echo of the old custom, real monuments, delivered archaeological excavations, finally, legends and customs of other Indo-European tribes. In Kiev, he could put his course is much broader than in Dorpat; his dream was of Slavic encyclopedia - systematic compilation of what has been done so far in science. The plan, he tried to do in their courses. Implement it in the literature it has not been given, but here, as in his earlier writings, affects a living understanding of science needs in terms of our education. Arising usually from another source, or submitting to the course of Western scientific theories, it existed fragmentary, episodic, and devoid of reason and common method, and generalizations, and therefore just as sketchy and it was reflected in a general education, which should have been its original support. Therefore, along with the special investigations, Kotlyarevsky considered necessary overviews and guidance. - Works Kotlyarevsky but separately published their books scattered part in the general media, part of the special, a Voronezh "Philological Notes", "work" and "Bulletin" of the Moscow Archaeological Society, "reports Uvarov awards at the Academy of Sciences", "Conversations "Moscow society of lovers of Russian literature," Proceedings "of the Kiev society chronicler Nestor et al in 1889 -. 1891 issued under Part II of the Academy of Sciences" Compositions AA Kotlyarevsky "(in the" Collection ", the department II, volume XLVII -. XLIX and separately, the three volumes); Edition finished fourth volume (including L "Compendium"), to which are attached the "Materials for the biography of Alexander Alexandrovich Kotlyarevsky" AN Pypin. Obituaries and memoirs: "Funeral for Alexander Alexandrovich Kotlyarevsky" (Kiev, in 1881; articles and speeches PI Aland, IN Zhdanov NP Dashkevich); "Sitzungsberichte der gelehrten estnischen Gesellschaft" for 1881; "Neue Dorptsche Zeitung" (October 1881); A. Kochubinsky "Results of Slavic and Russian Philology" (in the "Notes" Novorossiysk University, is the XXXIII, and separately: Odessa, 1882, pages 229 - 236); "Biographical Dictionary of professors and teachers of the Imperial University of St. Vladimir" (Kyiv, 1884), "Memories" Alexei Veselovsky (Kiev, in 1888; of the "Kiev Antiquity"); AP Storozhenko "Alexander Kostlyarevsky" ( "Herald of Europe", 1890, July); KN Bestuzhev-Ryumin, on the 1st volume of the "Collected Works", in the "Journal of the Ministry of National Education", that CCLXIV; "Alexander Kostlyarevsky as a teacher" ( "Russian Antiquities", 1893, June); "In memory of his father`s governor Leonid, Gattsuk AA, NA Popov and Alexander Alexandrovich Kotlyarevsky" (as a continuation of the "Historical Records" of the Moscow Archaeological Society, Moscow, 1893; article Linnichenko KI). A. Pypin (died).