PLATE 1. 



EXPLANATION OF FIGURES 

 ABBREVIATIONS 



a, acidophile cells c, i-eserve cells 



b, basophile cells m, macula 

 b', basophile cells with vacuoles n, nucleus 



Ventral glandular portion of hypophyses of male albino rats, normal and 

 experimented. All drawings made from the region (x) indicated in figure 1, p. 444. 

 Figures 2 and 3 were made from preparations fixed in neutral formol-Zenker and 

 stained with Mallory's aniline blue-orange G. Figures 4 and 5 were made from 

 preparations fixed in neutral formol-potassium bichromate, and stained with 

 Mallory's aniline blue-orange G. Outlines were drawn with the aid of a camera 

 lucida, using Spencer apochromat lens, 1.5 mm. and Spencer compensating 

 ocular, No. 5. The drawings were made at a magnification of 700 diameters and 

 reduced in reproduction to 600 diameters. 



2. Normal hypophysis of male albino rat, two months old. 



3. Hypophysis of rat of same age as in figure 2, one month after castration. 



4. Hypophysis of rat, three months old, two months after castration. 



5. Hypophysis of rat, eight months old, seven months after castration. 



462 



