268 



EDUARD UHLENHUTH 



This will be illustrated best by the photographs and pictures 

 which were made from both experiments. Both experiments 

 were photographed in natural size on October 10. Text figure 2 

 shows experiment 33 fully metamorphosed and the spots de- 

 veloped all over the body. Behind the eye four spots are visible; 

 two of them, lying behind each other in a line parallel to the 

 longitudinal axis of the body, are only highlights produced by 

 the reflection of the light on the black shining skin of the animal. 

 The other two lighter spots are two yellow spots belonging to the 

 graft. Just in front of the bulb of the grafted eye a third small 

 spot is situated which also belongs to the graft. All these 



Text figures b and c 



spots were almost orange yellow, thus being distinctly different 

 from the spots of the host; the two spots in back of the grafted 

 eye were considerably larger than any of the spots of the host, 

 which fact is well shown in the picture. Text figure 3 shows 

 experiment 34 photographed on the same day as experiment 33. 

 This animal was still larval at that time, as the gills are still pres- 

 ent and no yellow spots are developed. In accordance with the 

 condition of the host the graft, whose borders can be only partly 

 distinguished in this photograph, has no spots also. 



Nevertheless these photographs were not considered entirely 

 convincing since they lacked detail, in addition to which they 

 also could not demonstrate the rather minute details of the 



