Ill 



XENO-INDUCTIONS 



429 



the following: by Holtfreter [1934c, boiled ovary and muscles of the stickleback 

 (acrogenic), boiled heart and brain of the european salamander (acrogenic), 

 boiled liver and thyroid of man (notogenic)] ; by Rotmann (1942), guinea pig 

 mediastinal lymphnodes, treated by ethanol, acetone, chloroform boiled (noto- 



5h 9h. 12h 



Inductions 

 100- 



"lo 



4 days 

 Lg. tinne in 70° alcohol 



14 d. 3weeks 4.5 w. 



90- 

 80- 

 70- 

 60- 

 50- 

 40- 

 30- 

 20- 



^ trunk-tail 



1 1 1 T- 



B 12 h Iday 6d. 7d. IQd. 



Lg. time in 70° alcohol 



13 d 



2 days def. diet 



Log. of time 



3 weeks 4 w. 



Fig. 83. Experimental modifications of xeno-inductors. A. Changes in the inductive capacity 

 of mouse kidney implanted in newt gastrula after various lengths of time in ethanol. B. 

 Same experiment with guinea pig heart C. Changes in the parotidis of a guinea pig sub- 

 mitted to starvation, acr. - acrencephalic structures; rhomb. - deutencephalic manifestations ; 

 trunktail, cormomeritic and ouromeritic (Fig. 39, p. 368) structures. From Englander, 



Johnen and Vahs, 1953. 



Literature p. 483 



