44S THE SALIVARY GLANDS, BY E. F. W. PFLUGER. 



nuclei ; and I desire especially to direct the attention of ob- 

 servers to this singular form of ganglionic substance. The 

 relations of the ganglion cells of the gland are also deserving 

 of special investigation, which will certainly bear on the phy- 

 siological point of whether the sympathetic is distributed ex- 

 clusively to the bloodvessels, or whether it does not stand in 

 intimate relation to the secreting cells. 



92. 



Fig. 92. Solitary ganglion cell with a deposit of nucleated ganglionic 

 protoplasm. From the submaxillary gland of the Rabbit. Magni- 

 fied 480 diameters. 



5. THE REGENERATION OF THE GLANDULAR EPITHELIUM. 

 I have already called attention, in my work on " The Termi- 

 nation of the Secretory Nerves in the Salivary Glands," to the 

 alveolar-like small projections or bud-like processes of the so- 

 called excretory ducts, and have there expressed the opinion 

 that, both in the primary embryonal development of the gland, 

 as well as in the adult, new salivary cells and alveoli develop 

 from the salivary tubes. I am now in a position to describe 

 the process with accuracy. 



If the salivary tubes isolated by any of the ordinary modes, or 

 sections of them, after the action of hardening agents, be carefully 

 examined for the brush-like processes of the cylindrical epithe- 

 lial cells, it is easy to observe that the fibrils in various salivary 

 tubules, or even in separate sections of the same tube, may present 

 a very different appearance. As a general rule, even with the 

 highest powers, they appear as immeasurably fine varicose 

 fibrils (fig. 76). But all conceivable intermediate or transitional 

 forms may be met with, up to moderately thick fibres (0-001 

 millimeter) (figs. 93 and 94). In proportion as they increase in 

 size they lose their soft pale appearance, acquire high refractive 



