THE BLINDNESS OF THE CAM. I \1 \A. 



53 



apparently due to the interruption of the circulation in the eye 

 and the regeneration probably set in with the reestablishment of 

 the circulation in the transplanted organ. 



The older literature had many observations which were as- 

 sumed to prove an influence of light on development but the 

 writer has shown in a former paper that these conclusions were 

 not supported by the facts on which they rested. 



The writer has for years paid special attention to the possi- 

 bility that light might influence the formation of organs in 



BE.ATING HEART 



FIG. 2. 



animals, but he has succeeded in rinding only one form in which 

 such an influence can with certainty be demonstrated, namely 

 the hydroid Eudendrium. In his experiments in Naples he had 

 noticed that the polyps of this form regenerate better in the 

 light than in the dark and in Woods Hole he could convince 

 himself that the stems of Eudendrium cannot regenerate their 

 polyps if kept permanently in the dark. 2 



2 Loeb, " Uber den Einfluss des Lichtes auf die Organbildung bei Tieren," Arch.f. 

 d. ges. Physiol., LXIII., p. 273, 1896; Goldfarb, Journal Experimental Zoology, 3, 

 129, 1906; 8, 133, 1910. 



