ANATOMY OF THE ALIMENTARY CANAL. 
485 
The epithelium is diagrammatic. 
A clear space is seen to contain a blood-vessel ( v ). 
The upper wall of the clear space is formed by the endothelial cells ( e ) of 
the membrana propria. 
e'. Endothelial cells forming the lower wall of the perivascular space. 
m. The muscle-fibres : in the lower part of the figure they form a 
membranous covering to the endothelial cells. 
One of the muscles ends by being apparently attached to an endothelial 
cell (e). Compare fig. 10. 
Fig. 37. Camera Lucida: obj. 5, X 300 — oc. hi., obj. 8. 
Surface view of one of the terminal alveoli of the proper gland-tubes, from 
the pyloric end of the stomach of a dog ; the animal was killed two hours 
after meat food. 
A delicate reticulum is seen surrounding the epithelial cells. 
Fig. 38. Camera Lucida: obj. 5, X 300 — oc. hi., obj. 8. 
Cross section of one of the terminal alveoli of the proper gland-tubes, 
from the pyloric end of the stomach of a dog ; the animal was killed while 
fasting. 
me. Membrana propria. 
a. The faintly granular gland-cells with a dark line at their base. 
b. The epithelial cells are cut obliquely ; the nuclei are partly seen 
to the inner side of the dark line. 
Fig. 39. Camera Lucida: obj. 5, X 300 — oc. ill., obj. 8. 
Oblique section of one of the terminal alveoli of the proper gland-tubes ; 
from the pyloric end of the stomach of a dog ; the animal was killed two 
hours after meat food. 
me. Membrana propria. 
The nuclei and the reticulum are both clearly seen. 
Fig. 40. Camera Lucida: obj. 5, X 300 — oc. hi., obj. 8. 
Vertical section of epithelial cells of one of the terminal alveoli of the 
proper gland-tubes, from the pyloric end of the stomach of a dog killed five 
hours after meat food. 
b. Two cells whose nuclei are in a state of vacuolation ; the other 
cells have spherical nuclei. 
Fig. 41. Camera Lucida : obj. 5, X300 — oc. iil, obj. 8. 
Section of one of the terminal alveoli of the proper gland-tubes, from the 
pyloric end of the stomach of a dog. The stomach had been hardened in 
osmic acid and subsequently in chromic acid. 
The reticulum has a double outline, and is much broader than in fig. 37 
or fig. 38. 
