PLATE 4 
EXPLANATION OF FIGURES 
15 Longitudinal section through hinder end of the gizzard, showing the 
closely appressed folds of the inner wall and the thick surrounding sphincter 
muscle, which seems to make a tight closure. Flemming. Acid fuchsin. 35 
diam. 
16 Transverse section of the same region, showing the folds almost closing 
the passage, and the surrounding sphincter. Flemming. Acid fuchsin. 60 
diam. 
17 Transverse section of the wall of the crop, showing in one place an ab- 
normal appearance or ‘lesion’ of the epithelium. Flemming. Acid fuchsin. 
325 diam. 
1S Surface view of epithelium of the crop, showing unusual conditions. 
Several binucleate cells are present, and also a region of cytoplasm where cell 
walls are lacking. Perenyi. Ehrlich’s haematoxylin. 200 diam. 
19 Transverse section of stomach two days after ingestion of fat. The 
epithelium shows frequent dark regions which indicate absorption of fat here. 
The lumen of the stomach contains oil drops, pieces of chitin, and other sub- 
stances. Flemming. Acid fuchsin. 35 diam. 
20 Transverse section of a caecum, prepared in the same way as the stomach 
oi figure 19, and showing a similar condition of fat absorption. 35 diam. 
21 Transverse section of epithelium of stomach’s wall after ingestion of fat, 
showing in more detail the groups of cells which absorb fat, and also the em- 
bryonic cells which continually make new cells to replace the lost ones. Flem- 
ming. Acid fuchsin. 200 diam. 
410 
