190 



E. UHLENHUTH 



the normal /naximum size of the species, but continued beyond it. Thus 

 hypophyseal gigantism resulted as shown in Figs. 1 and 2. 



Relations in Birds. Only few experiments have been made on birds. 

 Wulzen (&) showed that, if anterior lobe feeding is commenced in early 



Fig. 1. Three male Ambystoma tigrinum; A and C fed anterior lobe of hypoph- 

 ysis, B control. The control animal B (approximately 185 mm. long) is the 

 largest animal of this species ever reared in our laboratory; A (233 mm. long) and 

 C (238 mm. long) are the largest hypophysis-fed animals. Note especially the elonga- 

 tion of the tail of the hypophysis-fed animals A and C. Reduced. Original. 



life, growth of the chicks is maintained beyond the normal period, and 

 giant growth may result in the male birds; while unfortunately only one 

 single experiment is available to prove the latter effect, Wulzen observed 



