JOURNAL OF MICROSCOPICAL SCIENCE. 



DESCRIPTION OF PLATES XI & XII, 



Illustrating Dr. Klein's Paper '* On the Lymphatic System 

 and the Minute Structure of the Salivary glands and 

 Pancreas/' 



Fig. 1. — From a sectiou through tlie hardeued parotid of the dog, 

 showing the interlobular connective tissue after teasing it slightly out and 

 staining it in logwood. 



1. The fascicle plates ; its constituent bundles of connective-tissue 

 are cut transversely and obliquely. 2. Minute bundles passing be- 

 tween neighbouring plates. 3. Flattened connective tissue cor- 

 puscles seen in profile. Magnif. power about 350. 

 Fig. 2. — From a preparation of the interlobular connective tissue of the 

 sublingual gland of the dog. 



1. A fascicle-plate seen from the surface; the connective-tissue 



fibres are not represented. 2. Elastic fibrils. 3. A nucleus of a 



connective-tissue corpuscle seen in profile. 4. A coarsely granular 



plasma-cell. 5. Lymphoid cells flattened against one another, 6. 



Nuclei of connective-tissue corpuscles seen full face. Magnif. power 



about 250. 



Fig. 3. — From the parotid of the dog, showing the transition of a 



minute intralobular duct into the intercalated or intermediate portion 



through the neck, 



1, Intralobular duct. 2. Neck. 3. Intermediate part, Magnif. 

 power about 350, 

 Fig, 4, — From a section through the ])arotid of the rabbit, showing the 

 various changes the intralobular duct undergoes in structure on its tran- 

 sition into the alveoli. 



At 1 the lining epithelium is columnar, and shows well the longitu- 

 dinal fibrillation. At 2 the epithelium is polyhedral without any dis- 

 tinct fibrillation ; the lumen of the duct is lined with a special inner 

 nucleated membrane. This part corresponds to the " neck " of the 

 duct. At 3 and 4 the epithelium consists of a layer of very trans- 

 parent flat elongated cells with oblong nuclei. The inner lining 

 membrane is very distinct. The two sections correspond to the inter- 

 calated or intermediary part. At 5 are the alveoli, cut in various 

 directions and lined with columnar epithelial cells, showing well the 

 intracellular reticulum, Magnif. power about 250. 

 Fig. 5. — From a section through the parotid of the dog, showing the 

 tubular nature of the alveoli. 



1, Wall of the alveoli seen from above. 2. Solid bridges between 

 neighbouring alveoli. 3. Lumen. 4. An alveolus cut obliquely. 

 The epithelial cells show very well the intracellular rcUculum. Magnif 

 power about 350, 



