From "Regeneration 

 and Transplantation," 

 by Dr. E. Korschelt. 



ILLUSTRATING 

 REGENERATION. 



A flat-worm cut so 

 as to produce two extra 

 heads and two extra 

 tails. The mouth on 

 the end of the protrusi- 

 ble proboscis or phar- 

 ynx is seen in the 

 center; a new mouth 

 and pharynx have been 

 formed in connection 

 with the head on the 

 left. 

 (After Voigt.) 



From "Experimental Embryology," 

 Jenkinson (Clarendon Press). 



EXPERIMENTAL EMBRYOLOGY 



Newt twins artificially produced by 

 tying a thread round a newt's egg after 

 it has divided into two, separating the 

 two cells. (After Herlitzka, from Kor- 

 schelt and Heider.) sf, the thread; g. 

 jelly membrane. 



From "Regeneration and Transplantation," by Dr. E. Korschelt. 



ILLUSTRATION SHOWING DIFFERENT STAGES (A, B, c) OF GROWTH OF TADPOLES PRODUCED BY 

 GRAFTING THE FRONT END OF ONE SPECIES ON TO THE HIND END OF ANOTHER 



(After Harrison. ) 



