THE ORIGIN AND DEVELOPMENT OF GASTRIC GLANDS. /I 



finely granular, resembling the " ovoid " cells described by Sewall 

 ('82) in the sheep, and the " ersatzzellen ' described by Toldt 

 (*8o) in the cat. In sections stained with hematoxylin and eosin 

 the nuclei of these cells take a deep blue, and the cells a deep red 

 color. This enables one to trace the changes in these cells in 

 DesmognatJws with comparative ease. Even in larvae less than 

 1 1 mm. in length these round cells may be observed. They 



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FIG. 3. Cross-section through the fundus region, where the pancreas is attached to 

 the stomach ; a., gland fundaments in various stages of development, forming groups 

 of several cells. By their growth they are displacing laterally the cells of the surface 

 epithelium, ep., making the insinkings more marked, d. Other letters as in Fig. I. 



Obj. T L, Oc. 2. 



appear \vith the differentiation of the stomach from the general 

 entoderm. These cells then divide, as shown in Figs, i, 2 and 

 3, forming groups of two, three and four cells. In Fig. I are two 

 of these cells in a state of division. All of the cells of the 

 epithelial and subepithelial layers appear equally capable of 

 multiplication but the gland anlages at this stages show marked 



