252 



CASWELL GRAVE 



On the other hand, when direct sunHght was reflected down- 

 ward through the water, the response to gravity was increased 

 from 77 per cent, the normal, to 85 per cent of the tadpoles. 



In all cases in which abnormal conditions of light were pro- 

 duced, whether reflected upward or downward through the 



TABLE 2 



Showing number and -percentage of tadpoles which became attached at various levels 

 in a cylinder when subjected to unusual light conditions 



column of water, an abnormally large number of tadpoles re- 

 mained floating at the surface, unattached but undergoing nor- 

 mal metamorphosis. 



These results seem to show that the positive response to 

 gravity is normally developed and most perfectly exhibited in 



