270 



EDITARD UHLENHUTH 



September 8 

 September 29 



October 17 



December 19 



1917 

 January 10 



January 10 



EXPERIMENT 33 



Land-condition 



Today the grafted eye was 

 examined for the first time, 

 but the eyes of the host 

 were not examined. The 

 yellow ring of the grafted 

 eye is broken up into black 

 and yellow dots 



Today the eyes of the host 

 were examined also. In all 

 three eyes, the two eyes of 

 the host and the grafted eye, 

 the yellow ring is broken up 

 into yellow dots 



In the iris of both eyes of the 

 host a number of very tiny 

 yellow dots are still present, 

 while the rest of the iris has 

 become black. In the iris 

 of the grafted eye a small 

 number of yellow dots are 

 still present, the rest of the 

 iris is black 



EXPERIMENT 34 



Larval -condition 



Host's eyes as well as grafted 

 eye still possess a plain, con- 

 tinuous yellow ring 



The rings of all three eyes are 

 free from any black pigment 



The inner section of the iris 

 of the grafted eye appears, 

 even with a larger magni- 

 fication of a binocular lupe to 

 be a continuous yellow ring, 

 in which no melanophores 

 are detected. The outer sec- 

 tion contains a large number 

 of yellow chromatophores, 

 which are darker than the 

 other yellow chromatophores 

 and more reddish, and con- 

 tains several parts in its 

 course which are made up by 

 grayish-blue cells. Both eyes 

 of the host are in exactly the 

 same condition as the grafted 

 eye 



All three eyes still in the same 

 condition as when last noted. 

 Killed by a second operation 



From these observations it is evident that in experiment 34 

 the ring of the grafted eye was still unbroken, about three months 

 after the yellow ring of the grafted eye of experiment 33 was 

 broken up into black and yellow dots. The same relation existed 

 between the eyes of the respective hosts. The condition of the 

 grafted eye as it existed on October 19, may be seen in figures 



