26 ELEMENTS OF HISTOLOGY. [Chap. iv. 



lies the nucleus, and around it is a substance which 

 appears granular, but which is of a fibrillar nature, 

 the nbrillye being arranged in a network, and extend- 



% 18. Network of Lymphatics in the Central VTendon of the 

 iaphragm of Babbit, prepared with nitrate of silver, so as to show 

 the outlines of the Endothelial Cells forming the wall of the 

 Lymphatics. 



a, Big lymphatic wssels ; 6, lymphatic capillaries; c, apparent ends of the 

 capillaries. (Handbook.) 



ing in many places up to the margin of the ground- 

 plate. The nucleus is limited by a membrane, and 

 contains a well-developed reticulum. The fibrillse 

 of the cell substance appear in connection with the 

 nuclear reticulum. 



31. As regards shape, endothelial cells differ 

 considerably. Those of the pleura, pericardium, 

 peritoneum, and endocardium of man and mammals 



