Józef Kowalewski, a founding father of Mongolian studies in Russia, stayed in Beijing from November 1830 until July 1831. He stayed with the Russian Ecclesiastical Mission and, being a Catholic himself, Kowalewski was very interested in the history and current state of Catholicism in China. In those years Catholicism in China faced severe persecution. All European missionaries were expelled from China with the exception of Bishop Gaetano Pirès Pereira, who was allowed to stay at the Russian Mission because of his old age. Kowalewski is said to have written a history of Catholicism in China which was destroyed by fire. However, unpublished diaries of Kowalewski, which survive in the Russian archives, contain much interesting information about Catholic cemeteries in Beijing, the life of Chinese converts, the Jesuit library and records of his talks with the last Catholic bishop.

The paper discusses the method of the substitution by homophones that is extensively used in many fields in China, among others onomastics, such as toponymy or anthroponymy. The Chinese language has always contained a considerable number of homophones, i.e. words pronounced alike but spelt/written differently and having different meanings. The situation resulted from two main factors: the nature of the Chinese language and the sound changes to spoken Chinese language, i.e. a strong tendency to sound simplification. The method of the substitution by homophones is mainly aimed at reshaping already existing names by replacing their previous form, for some reasons unwanted. However, it is also broadly applied to create new names by using words which are homophonic with the words denoting the idea they symbolize. The paper presents some various reasons and aims of the use of the method in the domain of Chinese geographical names, and the more detailed analysis of its use in the changing of old street (hutong) names after 1949 in Beijing. The research material consists of 1,159 hutong names, and the names changed by the use of the method accounts for 23.5% of the total.