L YMPH-NODES. 1 3 5 



which seem to be somewhat analogous to the lymph- 

 nodes, although not, as a rule, forming well-defined 

 organs. Thus we find in the intestines and stomach, 

 either single or in clusters, circumscribed nodules of 

 reticular connective tissue, whose meshes are filled 

 with small spheroidal cells, and resembling in most 

 respects the nodules in the cortex of the lymph- 

 nodes. These, which will be more fully considered 

 when we study the gastro-intestinal canal, are called 

 the solitary nodules of the stomach and intestines, 

 and Peyer's patches. Less well defined than these, 

 we find scattered in various parts of the body, larger 

 and smaller diffuse collections of small spheroidal 

 cells, lying in a reticular stroma, and forming the so- 

 called lymphoid tissue, which recent investigations 

 have shown to be of no little importance under 

 certain pathological conditions, although of their 

 relations to the lymph-vessels or their physiological 

 significance we know very little. These diffuse col- 

 lections of lymphoid tissue are found in the mucous 

 membrane of the bronchi, beneath certain serous 

 membranes in the liver, kidneys, and elsewhere, 

 and may be seen in the preparations of these parts 

 presently to be studied. 



TECHNIQUE. 



Lymph- Sinuses Injected. A general view of the lymph- 

 sinuses and their relations to the nodules and cords is 

 best obtained from sections of nodes whose lymph-chan- 

 nels have been filled with a colored solution of gelatin. 



