The Fourth International Congress of School Hygiene, held at Buffalo, New York, August 25-30, was a notable event in the progress of health supervision as a part of public education. Because of its importance, the author was detailed to attend this conference and prepare a report of it. This report contains three parts: (1) An introduction giving a brief summary of proceedings of the congress; (2) A summary of some of the most important papers; and (3) Concrete date of the school hygiene movement as shown in the scientific exhibit made under the direction of the congress and in connection with it. This bulletin contains the following abstracts: (1) School hygiene and child life (James Grant); (2) The State's duty in health supervision (Eugene H. Porter); (3) Some health needs of school children (Joseph Lee); (4) Some important factors preventing normal growth and development in school life (D. P. MacMillan); (5) Notes on the health care of school children (S. Adolphus Knopf); (6) A working plan of securing medical inspection (Alfred B. Morrill); (7) Medical inspection in Rochester (George W. Goler); (8) Medical inspection in cities of 100,000 or less (Clinton P. McCord); (9) Medical inspection in Massachusetts: Correlation of work of school physicians and local and State health officers (W. C. Hanson); (10) The hygienic construction of schoolhouses from an architect's standpoint (W. H. Kilham); (11) Ventilation and recirculation (Luther H. Gulick); (12) Air washing as a means of obtaining clean air in buildings (George C. Whipple and Melville C. Whipple); (13) The hygiene of the janitor (Homer H. Seerley); (14) The ideal school site (William H. Brainerd); (15) Open-air school architecture (John H. Van Pelt); (16) Vitalizing school children (Walter W. Roach); (17) Resolutions on open-air schools adopted by the Fourth International Congress on School Hygiene; (18) Objects of the National Mouth Hygiene Association (W. G. Ebessole); (19) Methods of spreading the oralygiene propaganda (George F. Burke); (20) Control of dental caries in school children (P. B. McCullough); (21) Sight saving and brain building (F. Park Lewis); (22) School lighting (James Kerr); (23) Defective vision from the economic standpoint (Lewis C. Wessels); (24) History and present status of the movement (Louise Stevens Bryant); (25) The nutrition of school children (Ira S. Wile); (26) Teaching nutrition values through penny lunches (Mabel H. Kittredge); (27) Public opinion and sex hygiene (Charles W. Eliot); (28) The social emergency (William T. Foster); (29) Education versus punishment as a remedy for social evils (Hugh Cabot); (30) Points of attack in sex education (Thomas W. Balliet); (31) Character and the sex problem (Richard J. Tierney); (32) Some methods of teaching sex hygiene (Laura B. Garrett); (33) Child classification and child hygiene (Arnold Gesell); (34) The distinctive contribution of the psychoeducational clinic to the school hygiene movement (J. E. W. Wallin); (35) Mental hygiene in the school (William H. Burnham); (36) Effects of athletics upon health (C. F. Stokes); (37) School athletics from a medical standpoint (J. W. Kime); (38) Athletics of elementary schoolboys in Boston (Edgar L. Raub); (39) Problems of the teaching of hygiene (Lillian M. Towne); (40) Protection of student health in the College f the City of New York (Thomas A. Storey); (41) School health work in Mississippi (Susie V. Powell); (42) Museum cooperation in the teaching of hygiene and sanitation (C. E. A. Winslow); (43) An experiment in student control of school sanitation and hygiene (G. W. Hunter); (44) Improving hygiene conditions among the native school children of Alaska (William Hamilton); (45) Hygiene in the Philippine schools (A. J. McLaughlin); (46) How women's clubs can aid the hygiene movement (Elsa Denison); (47) The school and vital statistics (Franklin C. Gram); (48) Accident prevention as relating to child welfare (Marcus A. Dow); and (49) Intestinal parasites and the rural school (John A. Ferreli). An index is included. Individual sections contain footnotes. [Best copy available has been provided.].