XIV 



THE LYMPH 



511 



It is very probable that there is direct communication, similar 

 to that which has been described in detail for the peritoneal cavity 

 and lymphatic capillary network of the tendinous centre of the 

 diaphragm, in all the other serous cavities of the body. Bizzozero- 



FIG. 244. Central tendon of rabbit's diaphragm treated with silver nitrate, viewed from pleura!) 

 surface. (Ranvier.) I, I, Lymphatic vessels in form of clear spaces anastomosing with one 

 another, and united by almost parallel inter-tendinous clefts. Magnification of 20 diameters. 



and Salvioli described the communicating canaliculi between the 

 lymphatic of the parietal pleura and the pleural cavity. 



Other writers admit free communication, in the form of small 



FIG. 245. (Left.) Central tendon of rabbit's diaphragm, treated with silver nitrate, seen from 

 peritoneal surface. (Ranvier.) /, Inter-tendinous lymphatic clelt; e, epithelioid investing 

 cells, forming at certain places along the lymph canaliculae islands of small, somewhat 

 granulated cells, which surround a stonia that is not always visible. 



FIG. 246. (Right.) Epithelioid platelet from frog's retroperitoneal membrane, treated with silver 

 nitrate, viewed from peritoneal surface. (Ranvier.) I, I, Intercellular lines of platelets which 

 surround an aperture or stonia .communicating with lymphatic canaliculi. 



pores or canaliculi, with the lymphatic rete in the free walls of 

 certain mucosae, such as the bronchial and nasal mucosa. The 

 interstitial adenoid tissue of the lungs is rich in lymph canals, 

 which form a large irregular lymphatic meshwork round the 

 bronchi, pulmonary lobules and blood-vessels. When animals are 



