274 EDUAKD UHLENHUTH 



September 30. Whole ring of grafted eye broken up into yellow and black dots. 



Experiment VII. September 25. On skin-graft, 1 yellow spot of the punc- 

 tatum type has developed. Grafted eye with dark places in the outer section of 

 the yellow ring. 



September 29. The yellow spot of the skin-graft has turned brighter. 



September 29". Host on land-condition. 



October 4. On skin-graft 3 more yellow spots of the punctatum type have 

 formed. Entire ring of grafted eye broken up into yellow and black dots. 



October 10. Photographed and a few days later painted (fig. 16); compare with 

 figure 15 of experiment IV. 



October 16. On skin-graft all 4 punctatum spots still present, but 3 of them 

 have become less dense. Only a few yellow dots are left in the grafted eye. 



December 7. All 4 spots of the skin-graft have become considerably fainter, 

 but are still present and of the punctatum type. No yellow dots left in the 

 grafted eye. 



Experiment IV. October 4. Host still in a larval condition. The ring of the 

 grafted punctatum eye is still an unbroken continuous line. 



October 10. Drawn and painted (fig. 15); compare with figure 16 of experi- 

 ment VII. 



October 26. Outer section of the ring of the grafted eye shows dark parts, 

 inner section an unbroken yellow line. 



October 27. Host on land-condition. 



October 31. Ring of the grafted eye broken up into yellow and black dots. 



November 20. Still a small number of yellow dots in lower half of, iris of 

 grafted eye present. 



November 20. Photographed. 



November 24. The photograph of November 20 is painted after the living 

 animal which has not changed since that time (fig. 17). 



In all five experiments the grafted organs of Amblystoma 

 punctatum underwent changes typical to metamorphosis of 

 these organs about the time that the tigrinum hosts left the 

 water. The changes of the grafted skin were stretched, as under 

 normal conditions, over a longer period, beginning somewhat 

 before and ending somewhat after the host had left the water. 

 Comparing the date of appearance of definite spots on the skin- 

 graft with the date of the host being set on land-condition, we 

 notice a very definite time-relation between these two phenomena : 

 the later the latter occurs the longer the former is delayed. 



Experiment V. . . 

 Experiment III. 

 Experiment VII 



APPEARANCE OF DEFINITE 

 SPOTS ON G RAFT 



August 28, 1916 

 September 22, 1916 

 September 25, 1916 



LAND CONDITION OF HOST 



September 2, 1916 

 September 22, 1916 

 September 29, 1916 



