92 Miss M. P. FitzGerald. The Origin of the [June 4, 
EXPLANATION OF PLATES. 
Figs. 1-17 represent results obtained in the gastric mucose of rabbits injected 
subcutaneously with a solution containing equal parts of an aqueous solution of 2°25 per 
cent. ammonium ferric citrate and 1°5 per cent. potassium ferrocyanide. | 
PLATE 7 
Fig. 1.—Opened stomach of Rabbit 5 fixed in absolute alcohol. Natural size. Drawing 
shows deposit of Prussian blue adhering to surface of mucosa of dorsal wall and on 
that of unremoved portion of ventral wall (pyloric region). Maximum reaction as 
observed on surface.—Note that Prussian blue is distributed in region of cesophageal 
opening and in adjacent region of lesser curvature, and that in this GRE: deposit 
also occurs in pyloric region. 
Fig. 2.—Vertical section of cesophageal region of stomach fixed in absolute alcohol, 
showing deposit of Prussian blue in central ]umina of gland tubules, in crypts, and 
on surface of mucosa. (Rabbit 2, 30 hours after the first injection.) x96. 
Fig. 3.—Gland tubules of gastric mucosa in which lumina are lined with granular 
deposit of Prussian blue. The irregularly occurring aggregations of deposit cause 
lumina to present a wavy, jagged appearance. ‘Two side branches can be traced 
passing to a cell ; within other cells small aggregations of deposit are seen. 1100. 
Fig. 4.—Gastric tubule showing deposit of Prussian blue in central lumen, in side branch, 
and in canaliculi resulting from its bifurcation. 1100. (Rabbit 2.) — 
Fig. 5.—Parietal cell penetrated by two side branches connected with lumen and 
containing Prussian blue. 1100. (Rabbit 2.) 
Figs. 6, 7, 8, 9.—Parietal cells, the canaliculi within which contain Prussian blue. 
Note larger side channel, ramification of fine canaliculi in the cytoplasm of cells, 
their wavy course, frequent proximity to nucleus, and beaded appearance due to 
isolated aggregations of deposit within. Figs. 6-9, x 1100. (Rabbit 2.) 
PLATE 8. 
Fig. 10.—Parietal cells with Prussian blue in canaliculi. 720. (Rabbit 2.) 
Fig. 11.—Gland tubules cut tangentially. Along the course of one of the central lumina 
and of a side channel, lined with Prussian blue, deeply stained oval enlargements 
occur, suggesting reservoirs containing accumulation of secretion. In one of the 
parietal cells canaliculi are seen in form of a network. 1100. (Rabbit 2.) 
Fig. 12.—Gland tubule. Prussian blue seen to be irregularly deposited along course of 
central lumen and to be present in side branch. An oval area suggesting a reservoir 
containing accumulation of secretion is seen, and small isolated aggregations of 
deposit within cells. 1100. (Rabbit 2.) 
Fig. 13.—Intertubular lymph channel containing Prussian blue. x920. (Rabbit 6.) 
Fig. 14.—Granular deposit of Prussian blue ina film of blue on surface of cells and in 
adjacent lymph space. x920. (Rabbit 5.) 
Fig. 15.--Intercellular lymph space containing granular deposit of Prussian blue in a 
pale blue ground substance. 640. (Rabbit 5.) 
Fig. 16.—Transverse section of gastric mucosa. Prussian blue is seen in an inter- 
glandular lymph vessel, and mixed with contents of blood yessel. x 640. 
(Rabbit 6.) 
Fig. 17.—Phagocytes in sub-mucous coat of stomach, which have taken up the granular 
deposit of Prussian blue. x 800. (Rabbit 5.) 
