PLATE 6 
EXPLANATION OF FIGURES 
32 Mucous gland empty of secretion, shown in median section. Cell walls 
present except on the ends next the lumen. © Nuclei basal and flattened. Duct 
completely developed and the intercalary region prominent. Zenker; Mal- 
lory’s connective-tissue stain. > 178. 
33 Mixed gland, showing the granular cells greatly enlarged and distended 
with secretion. Kleinenberg; thionin and eosin. X 178. 
34 and 35 Surface views of dermal (fig. 34) and epidermal (fig. 35) melano- 
phores drawn at the same magnification from unstained whole mounts of integu- 
ment. X 178. 
36 Mixed gland; condition probably permanent. One half (right) consists 
of mucous epithelium and secretion. In the other half there is present a con- 
tracted muscular layer and young granular cells. Duct well developed, the nuclei 
of the cells lining it densely stained. Mucus is being discharged. Kleinenberg; 
thionin and eosin. X 267. 
37 Mixed gland in which the mucous epithelium and secretion have been dis- 
placed by a granular epithelium developed from the intercalary cells. Mucous 
epithelium in the lower portion of alveolus; granular cells near the intercalary 
region. Kleinenberg; Ehrlich’s haematoxylin and eosin. X 178. 
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