Being both teachable and well adapted to grade, their educational value,
as proven by schoolroom tests, is of the highest order.  We therefore
cordially indorse and highly recommend the Pathfinder Series for use in
schools. 

MARY H.  HUNT, 

_National and International Superintendent of the Scientific Dep't of
the Woman's Christian Temperance Union; Life Director of the National
Educational Association._ 

ADVISORY BOARD: 

JOSEPH COOK, WILLIAM E.  SHELDON, ALBERT H.  PLUMB, D.D., DANIEL DORCHESTER,
D.D. 

PREFACE 

The term Physiology, or the science of the functions of the body, has come
to include Anatomy, or the science of its structure, and Hygiene, or the