STRUCTURE OF LYMPHATIC GLANDS. 209 



that no really free channel for it exists, seeing that the 

 elements lie crowded together like the particles in a 

 charcoal filter, so that the lymph trickles out again on 

 the other side in a more or less purified state. The fol- 

 licles should accordingly be regarded as spaces filled with 

 cellular elements but variously intersected by a trabecu- 

 lar network, and thus they can no longer be held to be 

 convolutions or dilatations of the lymphatics, but must 

 be viewed as interposing themselves in the course of 

 these vessels after they have broken up into a series of 

 ramifications continually increasing in minuteness. 



Of the minute elements contained in the follicles, the 

 cells of the parenchyma, some appear to become separated 



FIG. 62. 



A * *fjs% * 



AS> 



and afterwards to mingle with the blood as colourless 

 blood- or lymph-corpuscles. The more the glands be- 

 come enlarged, the more numerous are the cellular ele- 

 ments which pass into the blood, and the larger and more 

 perfectly developed are the individual colourless cells of 

 the blood wont to be. 



The same condition seems to prevail in the spleen. 

 Originally we all imagined that the veins were the chan- 



Fig. 62. Lymph-corpuscles from the interior of the follicles of a lymphatic gland. 



A. As usually seen ; a, free nuclei, with and without nucleoli, simple and divided. 

 b. Cells with smaller and larger nuclei, which are .closely invested by the cell-wall. 



B. Enlarged cells from a hyperplastic bronchial gland in a case of variolous pneu- 

 monia (comp. in Fig. 57 the colourless blood-corpuscles from the same source), a. 

 Largish cells with granules, and single nuclei. 6. Club-shaped cells, c. Larger 

 cells with larger nuclei and nucleoli. d. Division of nuclei, e. Club-shaped cells 

 in close apposition (cell-division ?). C. Cells with an endogenous brood. 300 

 diameters. 



14 



