EXPLANATION OF PLATES. 91 



a. Pedunculus of the sprout. 



b. Summit of it. The endothelium which covers this sprout, 



especially that of the summit, is of a germinating character. 



c. A vacuolated cell of the matrix. 



d. Young cells of the matrix. 



FIG. 32. From a pencilled portion of the mesentery of the same monkey 

 as Fig. 31. 



M. p. IV. 8. 



a. Migratory cells not yet perfectly detached from the nucleated 

 branched cells, which lie in the lymph-canalicular system b. 



c. The nuclei of those branched cells. There are numbers of 

 small elements and particles in the lymph-canalicular system 

 to be seen, which owe their origin probably to the nuclei of 

 the branched cells as well as to the migratory cells. 



F. Matrix unstained. 



FIG. 33. From the silver-stained mesentery of the same monkey. 



M. p. II. 7. 



In A a vacuolated cell is to be seen which lies below the endothelium 

 of the surface : its wall has already become differentiated into endo- 

 thelial plates a, and at the same time its cavity has opened, so as 

 to communicate with the free surface of the mesentery by a stoma 

 verum b. 



In B a sprout is to be seen, which projects between the endothelium 

 of the general surface a freely outwards : it stands in communication 

 with the tissue below the endothelium of the surface by means of a 

 protoplasmic pedunculus c ; its body is formed by a vacuolated cell 

 b, which in fact represents only the cell of a pseudo-stoma. 



FIG. 34. From a pencilled silver- stained preparation of normal omentum 

 of rabbit. 

 M. p. III. 7. 



a. Lymphatic- capillary vessel, showing the endothelial markings 



of its walls. 



b. An artery. 



c. Capillary blood-vessels ; and cZ, branched cells of a surrounding 



patch. 



e. A place where the endothelium of the lymphatic vessel 



becomes continuous with those branched cells. 



f. Migratory cells. 



