EXPLANATION OF PLATES. 87 



Fio. 15. From a preparation similar to that shown in Fig. 14 ; there wa3 

 a little more inflammation in the serous membranes. 

 M. p. III. 7. (Tube half drawn out). 



a. Endothelium of lymphatic capillaries. 



b. The same somewhat altered. 



c. Continuation between it and the cells of the lymph-canali- 



cular system. 



FIG. 16. A preparation similar to that shown in Fig. 14. 

 M. p. III. 7. 



a, 5, and c as in Fig. 14. 



FIG, 17. Silver preparation of the pencilled pleural- surface of tho 

 normal centrum tendineum of rabbit. 

 M. p. III. 7. 



I. Endothelium of lymphatic capillaries. 



c. Lymph-canalicular system of the serosa. 



s. The same, in which only the nuclei of the branched cells are 



to be seen. 



At t, continuation of the endothelium of the lymphatic vessels 

 with the lymph-canalicular system, or, properly speaking, with 

 their branched cells. 



FIG. 18. From a silver- stained preparation of the mesogastrium of a frog, 

 representing a node projecting freely from the surface of a large 

 trabecula t. 

 M. p. III. 8. 



a. Ciliated endothelium which covers the surface of that node. 



b. A vacuolated cell of the matrix of the node ; fine cilise are 



projecting into the vacuole. 



c. A vacuolated cell, the wall of which has already differentiated 



in individual endothelial plates. 



d. A vacuolated cell filled with nucleated young cells. 



FiG. 19. From a silver preparation of a pencilled mesentery of ape suf- 

 fering from chronic peritonitis. 

 M. p. III. 8. 

 M. Connective-tissue matrix not represented. 



a. The lymph-canalicular system, with its corresponding branched 



cells. 



1}. Large migratory cells which lie in that 1. c. system beside 

 the branched cells. 



