REACTIONS OF AMPHIBIAN LARVAE TO LIGHT 



197 



which they remained until the wounds had healed, after which 

 tap-water was gradually added. "When the larvae had attained 

 a certam size they were transferred to battery jars, each larva 

 being placed in a single jar, which was numbered. 



All the larvae tested were kept separate in small battery jars 

 about half full of water and in which a few water plants of vari- 

 ous kinds were placed. The frog tadpoles will feed upon the 



Fig. 1. Embryo of R. sylvatica, to show the stage of development used in 

 the beginning of the experiments (after Harrison). X9h 



Fig. 2 Embryo of Amblystoma punctatum, to show the stage of development 

 used in the beginning of the experiments. X 9|. 



leaves of these plants but the Amblystoma larvae will not. The 

 Amblystoma larvae were fed regularly during the course of the 

 experiments on small crustaceans which they devoured eagerly, 

 the blinded larvae seeming to have very little difficulty in seiz- 

 ing their quickly-moving prey. The jars were numbered, so 

 that the reactions of the individual larvae could be followed. It 

 was found necessary to isolate the Amblystoma larvae early for 



