PLATE XI & Xll—coutinued. 



Fig. 6.— An alveolus of the submaxillary p;land of the guinea-pig. 



1. The lining columnar epithelial cells show a distinction between 

 an outer homogeneous or faintly striated zone, including the nucleus, 

 and an inner more transparent zone, characteristic of the pancreas. 

 Magnif. power about 450, 



Fig.' 7. — From a section througli the sublingual gland of the rabbit. 



1. Intralobular duct in cross section. 2. Alveoli lined with mucous 

 cells. 3. Groups of cells forming crescents. 4. Interalveolar 

 ■ connective tissue. Magnif. power about 250. 

 Fig. 8. — From a section through the sublingual gland of the dog. 



1. Alveoli liued with ordinary columnar cells with distinct longitu- 

 dinal "fibrillation. 2. Alveoli lined with transparent mucous cells, 

 3. Interalveolar lymphoid corpuscles. Magnif. power about 350. 

 Fig. 9, — Transverse section through the sublingual gland of the guinea- 



P'g- 



I, Duct. 2, Transition of it into the alveoli. 3. Direct transi- 

 tion of the polyhedral epithelial cells of the duct into the columnar 

 transparent mucous cells of the alveoli. 4. Alveoli whose epithelium 

 is indicated in outline only. 5. The mucous cells show the intracellular 

 reticulum. Magnif. power about 350. 

 Fig. 10. — From a section through the sublingual gland of the guinea- 

 pig, showing a vein ensheatlied in a lymphatic vessel. 



1. Lumen of the lymphatic. 2. Lumen of the vein containing 



blood-corpuscles. 3. Endothelium of the lymphatic. 6 and 5. Adven- 



titia of the lymphatic. 4. Muscular (middle) coat of the lymphatic. 



7, A small blood-vessel cut across. 8. Endothelium covering the 



outer surface of the wall of the vein. 9. Endothelium lining the 



lumen of the vein. Magnif. power about 250. 



Fig. 11. — a and b are two mucous cells of the submaxillary of the dog, 



the nuclei in open connection with the cell reticulum ; c, two cells of the 



crescent, showing a dense cell reticulum. Magnif. power about 500. 



Fig. 12. — From a section through the submaxillary gland of the dog ; 

 the lymphatics are injected with Berlin blue. 



1. Interlobular ducts cut across. 2. Ganglia and nerve branches. 

 3. Lymphatics accompanying the ducts. 4. Lymphatics of the con- 

 nective-tissue septa between the lobules. 5. Circumalveolar lympha- 

 tics ; the gland alveoli are shown in outline only. Magnif. power 

 about 100. 

 Fig. 13. — From a section through the parotid of the dog; the lymphatics 

 are injected with Berlin blue. 



1. Large duct cut across. 2. Artery. 3. Vein. Magnif. power 

 about 250. 

 Fig, 14.— From a section through the submaxillary, gland of the dog; 

 the lymphatics are injected with Berlin blue. 



1. Intralobular duct cut across. 2. Alveoli cut in various direc- 

 tions ; the lining epithelium is indicated. 3. The same, without the 

 epithelium being indicated. Magnif. power about 150. 

 Fig. 15. — From a section through tlie sublingual gland of the rabbit; 

 the lymphatics are injected with Berlin blue. 



1. Cross section through the chief duct; in the fibrous coat of its 

 wall are lymphatic vessels in section. 2. Nerve branches in cross 

 section. 3. Nerve branches in cross section, but only indicated in 

 outline. 4. The columnar epithelium composed of two layers. 

 5. Ganglia. 6. Veins. 7. Arteries. Magnif. power about 150, 



