Вольное экономическое общество
He was an active member of the "Free Economic Society" (Вольное Экономическое Общество) and published a lot of scientific articles in the "Works" of the Society. In 1878 he represented the society at the World Fair in Paris. In 1886-1888 he served as the Vice-President of the Society. In 1899 Yermolov was elected a member of the Russian Academy of Sciences.