INTKODUCTION xv 



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. 



6. Manner in which fluids are brought into relationship 

 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, Pulmonary, 

 Cutaneous. 



5. Reproduction and Development. 



