ABOUT THE “CASE” OF PROFESSOR N. D. ZELINSKY: DOES SINGING INTERFERE WITH THE EFFICIENCY OF LABORATORY WORK?

New archival documents concerning the activities of prof. N.D. Zelinsky in Moscow University in 1900–1901 are presented and analyzed. Correspondence of the professor with the rector of the university and the minister of public education dealt with the question of reprehensibility of singing in a chemical laboratory. Keywords: history of chemistry, scientifi c-biographical research, Nikolai Dmitrievich Zelinskii, Moscow University, laboratory of organic and analytical chemistry.