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, however, 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 employed to good advantage. A few more
advanced works should, however, be frequently consulted. For this purpose
Martin’s _Human Body_ (Advanced Course), Rettger’s _Advanced Lessons in
Physiology_, Thornton’s _Human Physiology_, Huxley’s _Lessons in
Elementary Physiology_, Howell’s _A Text-book of Physiology_, Hough and
Sedgwick’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, Instructor 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 C.H. Nowlin, Central High School, Dr.
John W. Scott, Westport High School, and Professor A.E. Shirling, Manual
Training High School, all of whom read both manuscript and proofs, have
been incorporated. Considerable material for the Practical Work, including
the respiration experiment (page 101) and the reaction time experiment
(page 323), were contributed by Dr. Scott. Professor Nowlin’s suggestions
on subject-matter and methods of presentation deserve special mention. To