328 



EDWAKD C. DAY 



TABLE 1 



Reaction of Ascidia mentula to a beam of sunlight 15 mm} Animals 1 and 3 were 

 red pigmented; 2, 4, dnd 5 white. The ganglion of each animal xvas made more 

 accessible to light by cutting away part of the tunic. The tests were made on the 

 second day folloiving the operation 



