Fig. 22. — The effects of hypophysectomy and of the injection of anterior pitui- 

 tary extract after hypophysectomy on the thyroid gland of the newt, Trituriis viri- 

 descens. (From Adams and Martindale, Anat. Rec, 65, 319-31 [1936].) 



i,£, Photomicrographs of thyroid of normal newt at low and high magnifications. 

 2, 6, Photomicrographs of thyroid of newt 5 weeks after hypophysectomy. j, 

 Photomicrograph of thyroid of newt receiving anterior pituitary extract for 10 days. 

 Treatment was begun 5 weeks after hypophysectomy. ^, Treatment begun as in j", 

 but continued for 20 days. Photomicrographs /-^ were made at the same low mag- 

 nification, photomicrographs 5-6 at the same high magnification. 



