In the years 1869--1937, there were 15 Conventions of Polish Naturalists and Physicians. Since 1875, naturalists who have discussed in their several sections participated in the conventions. Mathematical conventions started in 1881 and finished in 1933. Three pre-war conventions: 1,900 in Krakow, 1907 in Lviv and 1911 in Krakow, gathered for over 1000 participants. At eight Congresses, starting from Congress IV in 1884, there were mathematical sections with lectures of mathematicians. It was then the only form of meetings of Polish mathematicians from various annexations. Particular importance for mathematicians had the XI Congress, which took place in 1911 in Krakow. The purpose of this work is to collect information about conventions, especially to provide titles of mathematical readings on eight of the congresses in the period 1884--1933.