96 THE ESSENTIALS OF HISTOLOGY 



In order to show the lymphatic vessels, it is generally necessary to 

 stain a tissue with nitrate of silver; but they may easily be in- 

 jected by sticking the nozzle of an injecting canula into any tissue 

 which contains them, and forcing coloured fluid under gentle pressure 

 into the interstices of the tissue. 



FIG. 120. LYMPHATIC PLEXUS OF CKXTRAL TEXDOX OF DIAPHRAGM OF RABBIT, 



PLEUKAL SfDK. 



a, larger vessels with lanceolate cells and numerous valves ; 6, c, lymphatic capillaries with 



wavy-bordered cells. 



In silvered preparations it may be observed that the lymphatics 

 always appear in the form of clear channels in the stained ground-sub- 



