INTRODUCTION 3 



In the study of physiology this order of evolution must be 

 reversed, and from the study of protoplasm the advance 

 must be made along the following lines : 



1. Protoplasm the physical basis of life; its activities 



and nature. 



2. Cells. Manner in which protoplasm forms the vital 



units of the body. 



3. Tissues. Manner in which these are formed by cells. 



Their structure, physical and chemical properties, 

 and vital manifestations. 



4. Nutrition of Tissues. 



a. Fluids bathing the tissues 



Blood and Lymph. 



b. Manner in which fluids are brought into relation- 



ship with tissues 

 Circulatory System. 



c. Manner in which substances necessary for the 



tissues are supplied to these fluids 

 Respiratory System. 

 Digestive System. 

 Food, its nature and quantity. 



d. Chemical changes in the tissues generally 



Metabolism and Heat Production. 



e. Manner in which the waste products of tissues 



are eliminated Excretion, Hepatic, Renal, Pul- 

 monary, Cutaneous. 



5. Reproduction and Development. 



