







Fk;. 5. Photomicrographs of midline sagittal sections through the hypothalamus, pituitary 

 gland and base of skull of three rabbits, (a) Normal animal. Note the portal vessels passing 

 from the median eminence to the pars distalis. (h) Stalk-sectioned animal. Regeneration 

 has occurred across the site of stalk section. The neural lobe is atrophic, (c) Stalk-sectioned 

 animal with waxed paper plate placed to intervene between the hypothalamus and pituitary 

 gland. Neural lobe atrophic. In all cases the vascular system was perfused with India ink 

 after death. (From Fortier, Harris and McDonald, 35.) 



