In conclusion: this department of school hygiene deserves the earnest aid of every young citizen, girl or boy. If each of us would honestly help by maintaining quarantine in the case of contagious disease, by observing the rules of the health department in fumigation, by acting upon advice given in case of eyestrain, bad teeth, or adenoids, and most of all by observing the rules of personal hygiene as laid down in this book, the city in which we live would, a generation hence, contain stronger, more prosperous, and more efficient citizens than it does to-day. REFERENCE BOOKS ELEMENTARY Hunter, _Laboratory Problems in Civic Biology_. American Book Company. Davison, _The Human Body and Health_. American Book Company. Gulick Hygiene Series, _Town and City_. Ginn and Company. Hough and Sedgwick, _The Human Mechanism_, Part II. Ginn and Company. Overton, _General Hygiene_. American Book Company. Richards, _Sanitation in Daily Life_. Whitcomb and Barrows. Richmond and Wallach, _Good Citizenship_. American Book Company. Ritchie, _Primer of Sanitation_. World Book Company. Sharpe, _Laboratory Manual of Biology_, pages 320-334. American Book Company. ADVANCED Allen, _Civics and Health_. Ginn and Company. Chapin, _Municipal Sanitation in the United States_. Snow and Farnham. Chapin, _Sources and Modes of Infection_. Wiley and Sons. Conn, _Practical Dairy Bacteriology_. Orange Judd Company. Hough and Sedgwick, _The Human Mechanism_. Part II. Ginn and Company. Hutchinson, _Preventable Diseases_. The Houghton, Mifflin Company. Morse, _The Collection and Disposal of Municipal Waste_. Municipal Journal and Engineer. Overlock, _The Working People, Their Health and How to Protect It_. Mass. Health Book Publishing Co. Price, _Handbook of Sanitation_. Wiley and Sons. Tolman, _Hygiene for the Worker_. American Book Company. REPORTS, ETC. _American Health Magazine._ Annual Report of Department of Health, City of New York (and other cities). Bulletins and Publications of Committee of One Hundred on National Health. _School Hygiene_, American School Hygiene Association. Grinnell, _Our Army versus a Bacillus_. National Geographic Magazine. XXV. SOME GREAT NAMES IN BIOLOGY