TRANSPLANTATION OF LIMBS IX AMBLYSTOMA 



145 



April 18. Proximal portion of the limb fused to the body wall. 

 Distal portion is free and points caudaU5^ The ectoderm dorsal to the 

 limb has developed into an abortive gill which is fused to the lateral 

 side of the arm (fig. 24). 



Case AA2S5i. April 3, 1920. Operation. Conditions of experiment 

 as in AA2S27. Wound covered. 



April 8. Limb bud developing with normal orientation. 



April 12. Developing limb bud points dorsally and is fused to the 

 side of the body. Gill ectoderm extends out along the dorsum of the 



Fig. 25 Drawing of left lateral aspect of case AA2Ss4. Animal preserved 

 eighteen days after the operation. X 10. 



Fig. 26 Drawing of right lateral aspect of case AA2S54 (fig- 25). Anterior 

 limb transplanted into the gill region as described in table 1 B. The limb (B) 

 is abortive and is fused dorsally with an extension of the gill ectoderm which 

 has migrated out over the extremity. A small atrophic gill has developed ventral 

 to the limb. X 10. 



free distal portion." One small gill developing anterior and ventral to 

 the limb. 



April 18. Gill ectoderm has completely fused along the dorsum of the 

 limb. Limb very abnormal and reduced to a club-shaped appendage. 

 Small atrophic gill ventral to the limb. 



April 22. Animal preserved (fig. 26, cf . fig. 25) . 



Case AA2S55. April 3. Operation. Experimental conditions as in 

 case AA2S27. Wound covered. 



April 4. Completely healed. 



April 9. Limb bud developing with normal orientation. 



