PREFACE V 



at the close of most of the chapters is mainly for class pur- 

 poses. While these serve a necessary part in the develop- 

 ment of the subject, it is not essential that all of the 

 experiments and observations be made, the intention being 

 to provide for some choice on the part of the teacher. A 

 note-book should be kept by the pupil. 



To adapt the book to as wide a range of usefulness as 

 possible, more subject-matter is introduced than is usually 

 included in an elementary course. Such portions, how- 

 ever, as are unessential to a proper understanding of the 

 body by the pupil are set in small type, to be used at the 

 discretion of the teacher. 



The use of books of reference is earnestly recommended. 

 For this purpose the usual high school texts may be em- 

 ployed to good advantage. A few more advanced works 

 should, however, be frequently consulted. For this pur- 

 pose Martin's Human Body (Advanced Course), Rettger's 

 Advanced Lessons in Physiology, Thornton's Human Physi- 

 ology, Huxley's Lessons in Elementary Physiology, Howell's 

 A Text-book of Physiology, Hough and Sedg wick's Hygiene 

 and Sanitation, and Pyle's Personal Hygiene will be found 

 serviceable. 



In the preparation of this work valuable assistance has 

 been rendered by Dr. C. N. McAllister, Department of 

 Psychology, and by Professor B. M. Stigall, Department 

 of Biology, along the lines of their respective specialties, 

 and in a more general way by President W. J. Hawkins 

 and others of the Warrensburg, Missouri, State Normal 

 School. Expert advice from Professor S. D. Magers, In- 

 structor in Physiology and Bacteriology, State Normal 

 School, Ypsilanti, Michigan, has been especially helpful, 

 and many practical suggestions from the high school 

 teachers of physiology of Kansas City, Missouri, Professor 



