6 PREFACE 



food, to the production of waste matters, and to the 

 development of heat and force, is dwelt upon throughout 

 the book. 



Many of the demonstrations at the ends of chapters are 

 new. All can be performed without the purchase of a 

 single article of apparatus, except a microscope. The 

 prepared microscopic specimens can be borrowed from a 

 physician. 



Most of the cuts are entirely new, and have been 

 sketched by the author from actual specimens. The 

 microscopic appearances of the tissues are especially illus- 

 trated. In each cut the illustration of a point, rather than 

 artistic effect, has been the end in view. 



The chapter on Repair of Injuries is an entirely new 

 feature in a school text-book. How the body restores 

 its natural functions after injury is as practical and simple 

 a subject as how it sustains itself in health. 



The author wishes to express his gratitude to his friend 

 and instructor, Professor William H. Porter, of the New 

 York Post Graduate Medical School, who has given his 

 valuable counsel and encouragement throughout the entire 

 preparation of the work; to Dr. W. E. Gordon, Principal 

 of the Patchogue High School, for his suggestions in 

 adapting the work to the practical needs of the pupils ; 

 and to Dr. Thomas E. Satterthwaite, ex-vice president of 

 the New York Post Graduate Medical School, and Dr. 

 William Pepper, M.D., LL.D., ex-provost of the Univer- 

 sity of Pennsylvania, for their kind criticisms of the proof 

 sheets. Thanks are also due Professor J. O. Lansing 

 for valuable pedagogical suggestions, and to Mr. Robert 

 Cruger for suggestions and aid in the illustrations. 



PATCHOGUE, N.Y. 



