Hygiene of Digestion. 



197 



the body, just as the condition of any community depends 

 on the average condition of the individuals of that com- 

 munity. 



Assimilation. The formation of tissue from the mate- 

 rials brought by the blood is assimilation. It is the last 

 step in building up the tissues. 



Capillaries 



Vein.... 



Artery, 



Artery 



Vein 



Capillaries 

 Fig. 85. Diagram of the Heart and Blood Tubes (Back ViewX 



Blood a Mixture of Good and Bad. In the blood streams 

 are combined the good and the bad. The newly digested 

 food is received into a current of impure blood in the post- 



