OF THE BLOOD AND CIECTJLATION. 215 



fibrous layers. The circulation through the lungs of the water 

 newt is a very beautiful object (fig. 230). The pulmonary 

 arteries (d} here expand very speedily into a fine-meshed 

 net- work of intermediate vessels, which in general admit no 

 more than single files of blood-corpuscles playing around very 

 minute islets of the parenchyma of the lung (fig. 231). The 

 vessels always appear with distinct parietes, and terminate 

 partly in capillary veins of the same character as themselves 

 (fig. 230), partly in larger venous trunks. The blood-corpus- 

 cles mixed with lymph-corpuscles (fig. 231, c),as already stated, 

 fill both arteries and veins close to their parietes. The same 

 appearances are presented in the branchial fringes of the larva 

 of the water-newt.]* 



* Professor Wagner's Physiology, page 294, et seq. 



