author's abstract of this paper issued by 

 the bibliographic service, november 10. 



A FURTHER CONTRIBUTION TO THE METAMOR- 

 PHOSIS OF AMPHIBIAN ORGANS 



THE METAMORPHOSIS OF GRAFTED SKIN AND EYES OF AMBLYSTOMA 



PUNCTATUM 



EDUARD UHLENHUTH 

 From the Laboratories of The Rockefeller Institute for Medical Research 



FIVE PLATES AND THREE TEXT FIGURES 



CONTENTS 



I. Introduction 238 



II. Certain morphological characteristics of the metamorphosis of the 



normal skin and eye in Amblystoma punctatum 241 



A. Skin 241 



B. Eye 246 



III. The experiments 248 



A. Homoplastic transplantation between larvae of Amblystoma 



punctatum 248 



1 . Material and method 248 



2. Results 252 



a. Metamorphosis of the grafted skin. •. 252 



b. Metamorphosis of the grafted eye 269 



B. Heteroplastic transplantation from larvae of Amblystoma punc- 



tatum to larvae of Amblystoma tigrinum 271 



1. Material and method 271 



2. Results 273 



IV. Discussion 276 



1. Some principles of metamorphosis deduced from the experiments. . 276 



2. A criticism of the method employed in the experiments 278 



3. A criticism of Weigl's experiments 280 



4. Relation between the metamorphosis-factor disclosed in the experi- 



ments and the thyroid-substance 283 



5. The mechanism of the development of the yellow spots and some 



remarks on specificity 285 



V. Summary 288 



VI. Bibliography 290 



237 



