PEARSE. — THE REACTIONS OF AMPHIBIANS TO LIGHT. 



179 



long axis of the body being at right angles to the direction of the rays. 

 The movements which resulted from this method of stimulation are 

 summarized in Table VII. The results show that the toad gives the 



^L 



B 



Figure 3. A, section of apparatus to test reactions of toads to stimu- 

 lation through the eyes alone; B, ground plan, a, screen; c, lamp; d, heat 

 screen; e, aperture for light; /, chimney for carrying away heat; g, slate 

 upon which the animals were placed; I, source of light; s, screen. 



same sort of positive reactions when the eyes are stimulated as when 

 the skin is illuminated. ' 



If the reactions of the two individuals just described were due to 

 unequal stimulation of the eyes, it ought to be possible to produce 



