This bulletin contains the first data upon after-class activities in American public schools gathered under the new school-extension record system of the United States Bureau of Education. The tabulations presented in this paper are based upon the returns made to the Bureau of Education on its school extension blanks for the scholastic year ended June 1916. These blanks were sent out to all municipalities of 5,000 population and over, and the number of cities that returned filled-in schedules was 554. Of these, 52 presented no school extension figures, and 27 gave data only upon night schools, while a few returns were so incomplete or so manifestly inaccurate that it was not possible to use them in compiling the present report. The 463 cities reported in this paper obviously do not comprise all in the country which are doing important extension work. A considerable number of school systems which are active in this field have not yet adopted the uniform record blank recommended in Bulletin No. 41, and without that recording system it is difficult to assemble the information required by the bureau's school extension questionnaire. Inquiry Blank Used is appended. (Contains 1 figure, 6 tables, and 1 footnote.) [Best copy available has been provided.]