PLATE II 
EXPLANATION OF FIGURES 
6. Wax reconstruction of epithelium of cesophagus at level of bifurcation of 
trachea. Human embryo of 55 mm., embryo 249. Stippled areas represent those 
covered with ciliated cells; non-stippled areas, those covered with squamous cells. 
xX 89. 
7. Same, human embryo of 91 mm., embryo 224. X 89. 
8. Wax reconstruction of a cardiac gland from lower end of cesophagus. 
Human embryo of 240 mm., embryo 186. Ruled surfaces represent those cov- 
ered with glandular cells; non-ruled, those covered with squamous cells. X 89. 
9. Wax reconstruction of single fold of epithelium of the cesophagus, viewed 
from the exterior. Human at birth, embryo 341. Showing cesophageal glands. 
x 89. 
