158 PRACTICAL HISTOLOGY [XX 



that there is only one layer of cells lining the basement 

 membrane. 



The cells are more or less polyhedral ; they have an 

 irregularly granular appearance, but the cell-granules, 

 seen in the fresh gland, have disappeared. The nuclei 

 are spherical (unless shrunken by the treatment), the 

 nucleus of each cell is placed a little nearer the outer 

 than the inner side of the cell. 



The lobular ducts consist of a single layer of slender 

 columnar cells, the inner borders of which form a 

 distinct ring bounding the obvious but small lumen ; 

 the outer boundary is not marked by a sharp line. 

 The outer part of the cells is striated (it stains readily 

 with picric acid and with eosin). The nucleus is ovoid 

 and situated at about the inner third of the cell. 



4. Section of lachrymal gland of a rabbit. (Mercuric chloride ; 

 hsematoxylin.) Note that the terminal secreting tubes are obvi- 

 ously tubular, they will probably show a distinction between an 

 outer, fairly homogeneous, stained zone, and an inner, irregular 

 granular, unstained zone. (The zones can be readily seen in the 

 fresh gland.) 



5. Mucous glands. Tease out in 2 to 5 p.c. NaCl 

 a piece of the orbital or sub-maxillary gland of a 

 recently killed dog 1 . Observe the distinct (mucous) 

 granules at the edges of the specimen. Irrigate with 

 HC1 1 p.c. ; the granules swell up and disappear ; here 



1 It is best to take the orbital gland from the body a day after 

 death; isolated mucous cells more or less columnar and full of 

 granules may then be obtained, and the nuclei and nucleoli may 

 also be visible. 



