300 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
6. When tested with a narrow beam of blue light, 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. 
