212 Gastric Glands of Dog after Gastroenterostomy 
somewhat less susceptibility of staining with basic dyes than those he 
describes, and they are not, as in his cells, the only part of the cell 
structure possessed of the affinity for chrome salts, as is clearly shown in 
those of my preparations in which the granules are slightly stained by 
hematoxylin while the rest of the cytoplasm is yellowish green. In the 
last particular they agree with Rabl’s, g1, description of the chromaffine 
cells of the suprarenal gland. 
Mitotic divisions are extremely rare among the parietal cells. Tortora, 
99, reports their presence in the neck region. Popoff, 97, describes them 
as occurring in inflammatory conditions. I was not able to find them in 
any of my preparations. 
The parietal cells are sometimes invaded by lymphocytes, which may 
then appear in the interior of them, as has been reported by Sewall, 79, 
Hamburger, 89, Bonnet, 93, and others. I have frequently seen them in- 
vaded by mast cells, both in healthy glands and in those modified as a 
result of operations. Stinzing, 99, reports similar observations of mast 
cells, which were especially abundant twelve hours after ingestion of 
food. 
(b). Neck Chief Cells. These have been well described by Bensley, 
98, as forming a layer of pyramidal cells immediately surrounding the 
lumen with their large end lying next it. The nuclei lying near the 
attached end are oval in cells which have thrown out their secretion, 
and flattened in those yet full of it. The cytoplasm consists of a tra- 
becular framework containing in its interstices the cell secretion. This 
is poured out during several hours after ingestion of food, but accu- 
mulates during rest near the free end of the cell, where it forms definite 
spherules in preparations of material fixed in alcoholic solutions, but is 
precipitated as an irregular mass upon the trabecular framework in 
material fixed in watery solutions. In whatever form it is present, he 
has shown that it stains differentially with mucin dyes, pink with muci- 
carmine, blue with muchematein, blue in Ehrlich’s indulin-aurantia-eosin 
blood-staining fluid, and takes a metachromatic pink tint in aqueous 
solutions of toluidine blue. For these reasons he regards it as mucus. 
It differs, however, in its reaction to mucus stains, from the mucus in 
the foveolar cells and on the surface. While occasionally mucus in both 
regions is stained in the same section, usually when one region is well- 
stained, the mucus in the other is faintly or not at all stained. Bensley 
explains this difference on the basis of the multiplicity of the chemical 
constitution of mucins, which is described by Mayer, 97, and others. The 
neck chief cells pass by a gradual transition into those of the foveolar 
