430 MAINE AGRICULTURAL EXPERIMENT STATION. I912. 



Fourth Plate. 



Figure 469. Oblique section through the line of transition from albu- 

 men portion to isthmus. Note the absence of all tubular glands along- 

 this line. At the left of the figure a portion of the albumen secreting 

 region is shown and at the right a portion of the isthmus. X30. 



Fifth Plate. 



Figure 470. Section from actively secreting isthmus showing opening" 

 of tubules. x6oo. 



Figure 471. Section from isthmus showing gland cells and epithelium 

 after the period of active secretion. x6oo. 



Figure 472. Section of the epithelium and opening of tubular gland 

 from the uterus. x8oo. 



Figure 473. Transverse section through the wall of the vagina. xSO. 



Figure 474. Section of the epithelium from the vagina showing the 

 unicellular glands. x6oo. 



