300 bulletin: museum of comparative zoology. 



6. When tested with a narrow beam of bhie Hght, the skin of 

 eyeless toads was equally sensitive on all parts that were tested. 



7. The distribution of the effectiveness of the several lights did 

 not correspond very closely to their relative distribution in the spec- 

 trum. 



8. The effects of each light were specific, and due probably to 

 specific chemical changes produced by each. These effects were, 

 primarily, a function of the wave-lengths, and secondarily, of the 

 absorption of the light. 



9. The intensity in the several lights used could have had no speci- 

 fic effect on the reactions of the toads to the different lights, for each 

 light contained approximately the same amount or energy. 



