326 THE LYMPHATIC SYSTEM, BY F. v. KECKLINGHAUSEN. 



probable by the well-known fact that in the lymph, and espe- 

 cially in the chyle, not only colourless, but also red corpuscles 

 may be discovered. Herbst instituted a series of experiments 

 in which he augmented the total volume of the blood by slowly 

 introducing blood, in the greater number of instances, but 

 frequently also other fluids, as milk, into the jugular vein ; and 

 in these he constantly observed the presence of red blood cor- 

 puscles in the abundant contents of the thoracic duct, and, 

 where that fluid was employed, milk corpuscles also. Lastly, 

 Dr. Rud. Bb'hm has very recently seen in silvered preparations 

 of the synovial membranes the serous canals become continuous 

 with the blood capillaries in a manner very similar to that 

 noted above as occurring in the lymphatic capillaries. 



THE LYMPHATIC FOLLICLES. 



In various parts of the digestive organs there are to be found, 

 situated within the mucous and submucous tissues, and also in 

 the spleen and the lymphatic glands either projecting from their 

 surface or appearing on section, small spherical bodies of the size 

 of a millet seed the so-called Follicles (see the article devoted 

 to the digestive tract and the spleen). From the description 

 given by Briicke, it was already known that the solitary 

 follicles of the intestine and of Peyer's patches stood in inti- 

 mate relation to the vessels of the lymphatic system. And this 

 has been fully borne out by the more accurate modes of investi- 

 gation recently adopted, but it has been further proved that 

 the lymphatic follicles of the pharynx, tonsils, and lingual glands 

 are also much richer in lymphatics than the remaining portions 

 of the mucous membrane ; that all these structures consist of 

 tissues which recur in the lymphatic glands, and they may there- 

 fore truly be accounted a portion of the lymphatic apparatus. 

 We must commence with the description of the follicles on this 

 account also, that they represent a very simple type of the 

 lymphatic gland. 



The follicular tissue (adenoid substance of His, cytogenic 

 tissue of Kolliker) is characterised, first, by its reticulum, and 

 secondly, by the lymph corpuscle-like cells which are adherent 

 to the reticulum. 



