DISTRIBUTION OF THE NERVES IN THE SALIVARY GLANDS. 439 



some distance on its outer surface to the nearest epithelial cells, 

 in order to penetrate over these into the alveolus (fig. 83). The 

 nerve becomes blackened by perosmic acid up to the point 

 where it perforates the membrana propria ; at this point the 



Fig. 84. 



Fig. 84. From the Rabbit. Medullated fibre blackened by perosmic 

 acid. Magnified 500 diameters. 



medulla appears to cease (figs 84 and 87). That the membrana 

 propria is perforated is shown in the most striking manner by 

 the circumstance that the continuity of the medullated and 



Fig. 85. 



Fig. 85. From the Rabbit, after maceration in iodized serum, show- 

 ing the termination of a medullated nerve in an alveolus. From the 

 submaxillary gland. Magnified 590 diameters. 



frequently very thick primitive fibres with the salivary cells 

 may often be easily demonstrated. I have seen this occur in 

 a great variety of modes, and in " the clearest manner in the 



