i <>*NECTIVE TISSUE. 



65 



bran e of the fibre, and the central layer with its interior. For 

 a detailed discussion of the reactions of elastic tissue the reader 

 is referred to Mall's work. 



(e) Retieulum. This is the name given by Mall to a tissue 

 making up the framework of many glands and organs. It is 

 found usually in the form of a network of interlacing fibres 

 which are in no way connected with the connective-tissue cells. 

 Since this tissue can be distinguished from elastic tissue and 

 white fibrous connective tissue by means of its chemical prop- 

 erties, it must be considered by itself. 



FIG. 34. 



Retieulum from lymph gland of dog, stained with acid fuchsin and picric acid (Mall). X 150. 



Retieulum is separated from yellow elastic tissue by the fact 

 that it is not digested by pancreatin ; and from white fibrous tissue 

 by its greater power of resisting the action of various reagents. 

 White fibrous tissue dissolves in boiling HC1 (0.5 per cent.) in 

 one minute, while reticulum in the same solution remains intact 

 for eighteen minutes (Mall). A similar resistance is found in 

 treatment with a solution of KOH. This resistance, however, 



