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PREFACE. 



THIS little book is an attempt to express accurately 

 and yet in simple language, those facts concerning the 

 structure and actions of the living human body which 

 it is desirable, for practical purposes, that every one 

 should know. It is essentially a school-book of personal 

 hygiene. Little, if any, more Anatomy and Physiology 

 is introduced than is necessary to make clear the reasons, 

 as regards the preservation of health, for following or 

 avoiding certain courses of conduct. This, of course, 

 includes all the broad facts of Human Anatomy and 

 Physiology; but subjects of merely professional impor- 

 tance or of purely scientific interest have been omitted. 

 As regards Hygiene, attention is for the most part only 

 directed to matters which are usually within the easy 

 control of each individual. It seems useless to burden 

 boys and girls with sanitary laws which need the aid of 

 a physician or engineer for their successful application. 



A very earnest attempt has been made to present the 

 subject so that children may easily understand it, and, 

 wherever possible, to start from familiar facts and gradu- 

 ally lead up to less obvious ones. In this part of the task, 

 which was really the most difficult, I have had so much 

 aid from my wife's experience in teaching young pupils, 

 that her name propedy^has a uUice on the title-page. 



