The full verified text of the Decree of the Provisional Government of Russia dated July 1 (14), 1917, from the newspaper “Newsletter of the Provisional Government” dated July 23 (August 5), 1917, about the establishment of the Faculty of Physics and Mathematics at the Saratov University is analyzed. The main milestones of the biography of Pavel Ivanovich Preobrazhensky (1874–1944), are given.