% in 

 Explants 



Otocyst 



Notochord 

 Tall 



Saloncer 

 Nose 



- Eye 



Ant. 

 trunk 



Post, 

 trunk 



Fig. 90. Influence of host levels on the inductions of different organs by fresh liver of Triturus in Triturus 

 embryos. Abscissa: host levels; left ordinate: frequency of inductions of different organs; right ordinate: fre- 

 quency of the same organs when induced by fresh Triturus liver in explants (ectodermal vesicles). (After 

 Chuang, '39.) 



Levels ♦Head 



Ant. 

 trunk 



Post, 

 trunk 



Fig. 91. Influence of host levels on the inductions of different organs by alcohol- treated livers and kidneys 

 of different vertebrates in Triturus embryos (see text). Abscissa: host levels; ordinate: frequency of induc- 

 tions. This graph is based on the figures given in Table 10, Toivonen ('40). 



