REACTIONS OF MELANOPHORES OF AMBLYSTOMA 247 



tion the optic vesicles were also removed by the method de- 

 scribed in former papers (Laurens '14, p. 196 and '15, p. 579). 



A complete series of experiments were carried out on these 20 

 larvae together with control normal seeing and eyeless larvae, 





P 



:\ ^ V 







v^. Hltl^•' 



Fig. 6 The anterior end of a 42.0 mm. larva to show the appearance of the 

 paraphysis (with the surrounding blood vessels) as seen from the outside. 



for the purpose of seeing whether there was any difference in 

 their reactions to darkness, light and backgrounds and in the 

 time when these reactions first made their appearance (Laur- 

 ens '15, pp. 583-595). The results were in complete agreement 

 with my earlier ones. But unfortunately upon sectioning the 



