CH. IV.] 



LYMPHOID TISSUE. 



5' 



elsewhere. There are few or no elastic fibres in it, but the white 

 fibres run in very fine bundles forming a close network. ' The 

 bundles are covered and concealed by flattened connective-tissue 

 corpuscles. When these are dissolved by dilute potash, the fibres 

 are plainly seen (fig. 71). 



Adenoid or Lymphoid Tissue. 



This is retiform tissue in which the meshes of the network are 

 largely occupied by lymph corpuscles. These are in certain foci 

 actively multiplying ; they get into the lymph stream, which 

 washes them into the blood, where they become the colourless 



Fig. 72. Part of a section of a lymphatic gland, from which the corpuscles have been for 

 the most part removed, showing the supporting retiform tissue. (Klein and Noble 

 Smith.) 



corpuscles. It is found in the lymphatic glands, the thymus, the 

 tonsils, in the follicular glands of the tongue, in Peyer's patches, 

 and in the solitary glands of the intestines, in the Malpighian 

 corpuscles of the spleen, and under the epithelium of many 

 mucous membranes. 



Basement Membranes. 



These are homogeneous in appearance, and are found between 

 the epithelium of a mucous membrane and the subjacent con- 

 nective tissue. They arc generally formed of flattened connective- 

 tissue corpuscles joined together by their edges, but sometimes 



I 



