30 Emil Goetsch. 
of tubules being of this character. These I interpret, as did Schaffer, 
as temporarily inactive mucous cells. These tubules are always sur- 
rounded by a tissue containing large numbers of plasma cells. 
The duets of the glands (Fig. 12) are lined by a stratified epithelium 
except in the very beginning in the gland where for a short distance, 
only 12 micra in some eases, a single layer of cylindrical cells is 
found. The intralobular ducts have a double layer of cells and the 
large ducts in the submucosa two to four layers of cells, the number 
of layers increasing as the surface of the mucosa is approached. The 
shape of the cells varies with the degree of tension of the surface, 
produced either by distension of the duct with secretion or by the 
Mucous 
tubules 
Fic. 12. Portion of a lobule of an cesophageal gland of man, showing 
entrance of duct and transition of duct epithelium to glandular epithelium. 
A. Lobular duct. B. Transitional duct lined by simple columnar epithelium. 
<< 180. 
formation of folds in the mucous membrane. In the relaxed duct 
the superficial layers of cells are cylindrical, the deeper layers poly- 
gonal except very near the epithelium, where the epithelium becomes 
stratified squamous. In the distended or stretched duct both super- 
ficial and deeper layers of cells become more or less fusiform in sec- 
tion. In all cases the superficial layers of cylindrical or flattened 
cells stain more strongly in eosin than the second layer, indicating 
a probable change in a slight degree of the protoplasm in the direc- 
tion of cornification. 
As regards the superior cardiac glands of Schaffer and Riidinger 
I have been able to make no study of them owing to the absence of 
