PLATE 9 



EXPLAXATIOX OF FIGURES 



20 Section of discharged follicle of hen ovary, stained in Alallory's stain. 

 Connective tissue = blue. Corpuscle = red. Interstitial cells = purple. Lu- 

 tear pigment = yellow. 



21 Section of older corpus luteum of cow, stained in Mallory's stain. Tissues 

 colored as in figure 20. 



34 



