Demarcation and Phagocytosis. 



269 



ing how the inflammatory reaction is able to carry out its protec- 

 tive purpose by removal or encapsulation of the harmful substances. 

 Demarcation and Phagocytosis are two important functions of 

 the cells coming into consideration in the inflammatory process. 

 The motile cells of leucocytic and lymphoid types, distinguished 

 generally for their phagocytic properties even in normal circum- 

 stances, arc attracted by the metabolic products of an injured tis- 

 sue or bv the chemical influences of the inflammatory agents. They 

 take u]) all the substances in a disintegrating tissue which are acces- 



Fig. 51. 

 Inflammatory scar in the kidney of a hug. 



sible and with which they can deal, as albuminous granules, blood 

 remnants, pigmentary granules and fat globules, and, indeed, all 

 sorts of minute particulate elements, as vegetable and animal micro- 

 organisms ; carrying these objects off or destroying and rendering 

 them inert by the influence of the digestive power of their proto- 

 plasm. However, this power of phagocytosis also resides in the 

 fixed cells. In the chemotactic accumulation of the cells, which 

 takes place around foreign bodies or necrosed tissue, the leucocy- 

 tes, fibroblasts and angioplasts and giant cells form a protective 

 wall which either permanently imprisons the foreign body or from. 



