PKEFACE vii 



plan as the one indicated she may stick to the letter of 

 the law and at the same time follow the spirit of her 

 better judgment, laying, in each individual case, the 

 stress where it is most needed. 



This book has been written with the conviction that 

 the development of a pupil's mind is more important 

 than the accumulation of facts and with the conviction 

 that physiology may be made to contribute to this mental 

 development by the appeal which it makes to the reason- 

 ing power. Children like to reason, and a sympathetic 

 teacher, interested in the subject, and prepared to teach 

 it, can, by appealing to the reasoning faculty, change the 

 study of physiology from a perfunctory compliance with 

 the law to a real pleasure. 



The manuscript has been read by Miss A. St. L. 

 Eberle, to whom I am much indebted for criticism and 

 suggestion. I am further indebted to Messrs. Henry 

 Holt and Company for much courteous consideration, 

 and for permission to use illustrations from some of 

 their publications; especially am I indebted for the 

 use of those from " A General Biology " by Sedgwick 

 and Wilson ; " Principles of Physiology and Hygiene " 

 by Dr. George Wells Fitz ; " The Human Body " by H. 

 Newell Martin ; and " A Manual of Zoology " by Rich- 

 ard Hertwig. 



