x PLAN OF THE BOOK 



topics, reviews, and summaries will do much to improve 

 the character of the teaching in physiology. 



Gradation of Subject-matter. There is a steady, but 

 well-graded, progress from the easy and simple to the 

 more difficult and complex, both in the mode of treat- 

 ment and in the arrangement of the topics. On the 

 whole, the facts presented in this text-book may be a 

 little more difficult than those found in most of the 

 physiologies for corresponding grades, but the sen- 

 tences are short, the language clear and simple, the 

 treatment logical and connected, the illustrations nu- 

 merous, and the reviews and summaries frequent, so 

 that the book will not seem difficult to the pupils. 



