HuBER, Sympathetic Nervous System. loi 



obtained with methylen-blue staining of the salivary glands of 

 mammalia, also finds medullated and non-medullated nerves in 

 the glands, and was able to trace these nerve fibers through the 

 membrana propria, and between the gland cells. In another 

 paper Cajal (55) treats of the ending of the nerves in the pan- 

 creas. In this tissue when stained with the Golgi method, he 

 was able to trace the ultimate branches of the nerves between 

 the gland cells. Miiller (56) corroborates in the main Cajal's 

 results on the ending of nerves in the pancreas. He also finds 

 that non-medullated nerves form a plexus around the alveoli — 

 " Ein Flechtwerk von feinen Faden, welche unmittelbar den 

 Zellenkorpern anliegen und mit freien Endzweigen schHessen." 

 Miiller was not able to trace the ultimate fibrillae between the 

 gland cells. Further observations were recorded by Retzius 

 (57) on the submaxillary glands of rabbits and dogs, in which 

 he gives no definite account of the ultimate ending of the 

 nerves, but mentions the existence of sympathetic ganglion 

 cells, by the side of the ducts and blood-vessels of this gland, 

 but states that he was not able to acertain the distribution of 

 the axis cylinders belonging to these cells. In another communi- 

 cation on the ending of nerves in the parotid of the salamander 

 (Salamandra maculata) and the sublingual of lizards (Lacerta 

 agilis), Retzius (58) describes inter-epithelial endings. Both 

 of these investigations were made with the Golgi method. 

 Dogiel (59) has studied the ending of nerves in the lachrymal 

 glands of rabbits and Guinea pigs with the methylen-blue 

 method. In this very admirable paper he gives the following 

 account of the nerve endings. The nerves entering these glands 

 are almost exclusively non-medullated. They follow the gland 

 ducts and blood-vessels. The branches of these nerves form 

 plexuses about the alveoli, external to the membrana propria. 

 From these plexuses fibers are given off which pierce the mem- 

 brana propria and form a second plexus between it and the 

 gland cells, and from this second plexus, nerve fibrils pass be- 

 tween the gland cells, which branch, anastomose and form an in- 

 tercellular network, in the meshes of which are found the gland 

 cells. Dogiel finds no free ending on the cells ; when such an 



