242 Proceedings of the Royal Society of Edinburgh. [Sess. 
diameters.) Muir’s staining method (alcoholic eosin and methylene blue). No 
mitoses are visible in this pancreas. The zymogen granules, which are coloured red, 
are far more abundant than in fig. 1. 
Plate II. 
Fig. 3. Section from the same pancreas as that shown in fig. 1, but stained by 
Mallory’s method (acid fuchsin, orange G, and aniline blue) instead of by Muir’s 
method. Photograph magnified 100 diameters. The zymogen masses are stained 
deep red by the acid fuchsin and come out black in the photograph. An islet of 
Langerhans is included in the field. 
Fig. 4. Section from the same (normal) pancreas as that shown in fig. 2, but 
stained with Mallory instead of by Muir’s method. Magnified 100 diameters. The 
deep red masses of zymogen come out black in the photograph. An islet of 
Langerhans is included in the field. 
{Issued, separately January 19, 1917.) 
