78 Miss M. P. FitzGerald. Zhe Origin of the [June 4, 
No 
y 
x Ko — 2 
A 
Fic. 1.—Diagram of Unopened Stomach of Rabbit. (Rabbit 5.) 2 size, ventrai aspect. 
Crosses (X) are placed in region in which occurred the diffuse green coloration 
transmitted trom the deposit of Prussian blue within stomach. 
Broken line indicates outer limit of visible colour ; A.P., Antrum pylori. 
the usual situation in the region before named, a further deposit, slightly 
separated from the main deposit, covering an area of about 2 sq. ems., was 
found in the pyloric region beneath the antrum, extending to within 6 mms. 
of the pyloric opening. This was the solitary instance of an occurrence of 
a deposit of Prussian blue in the pyloric region; whether due to the intensity 
of the reaction and mechanical transference, or to a cause inherent in the 
mucosa of this region, can only be ascertained by further experiments. In 
another rabbit, in which the mucosa was tested with litmus paper, an acid 
reaction was obtained in the pyloric region, although less marked than in the 
other regions of the stomach. 
Ebstein* found that the surface of the gastric mucosa of the rabbit in the 
pyloric region was acid in reaction, and it will be remembered that this was 
also observed by Edingert when experimenting with sodium alizarin (see 
p. 62), and by Frankel also, on one occasion, when using a decolorised 
solution of acid fuchsin (see p. 67).? 
A diagram is given of the dorsal wall of the opened stomach of the rabbit 
(Rabbit 5) to illustrate the region in which the Prussian blue was usually 
found, its maximum observed extent, as well as the additional and unusual 
area in the pyloric region. It is copied from a drawing of the stomach in 
which the areas covered by the deposit were carefully depicted, immediately 
after the mucosa was exposed. 
The contents of the stomach (Rabbit 5) contiguous to the areas of the 
mucosa over which the Prussian blue was deposited were impregnated with 
* € Archiv Mikros. Anat.,’ 1870, vol. 6. 
+ Edinger, zhid. 
+ Frankel, cid. 
