256 



VASIL OBRESHKOVE 



TABLE 4 



Reaction-times in seconds of tadpoles of Rana clamilans to lights of different 



intensities: A, with eye and skin exposed to light,' B, with skin only 



exposed to light. Light applied from the side 



accompanying the increase of the intensity of illumination. 

 The intensity-time pi»oducts agree well with each other under 

 the two conditions and with those recorded in table 2. With a 

 light intensity of 20 candle-meters the characteristic deviation 

 already mentioned again becomes evident. 



