after the death of leo tolstoy, bulgakov remained for several years in yasnaya polyana and worked on his notes which were published in 1911 under the title "the last year of leo tolstoy" and "the conception of life by leo tolstoy in his letters to his secretary". both books were soon translated into several languages. he began the laborious task of describing the library of tolstoy. he took an active part in publishing the works of leo tolstoy and the organization of the tolstoy museum in moscow. in 1917 he published "christian ethics", an authoritative account of the religious and ethical teaching of tolstoy.