172 



H. L. WIEMAN 



Embryo T. R. 5 (fig. 9) developed a marked ventral bend in 

 the body which interfered with its maintaining an upright posi- 

 tion. The notochord was not disturbed by the operation, which 

 was performed April 8th. Tactile stimulation from time to time 

 showed no evidence of conductivity anteroposteriorly, or reverse, 

 through the transplant. Thus for May 10th my notes show the 

 following record: 



Fig. 9 Embryo T.R.5, May 17. Operated April 8. 



Fig. 10 Embryo T.R..5, sagittal sections, -s, connective-tissue septum. 



Stimulation anterior to transplant: shght twitching of gills. 



Stimulation posterior to transplant: active body movement; 

 head quiet. 



Stimulation at site of transplant: active twitching of gills. 



This record points to a descending connection from the an- 

 terior stump to the transplant, but no posterior connection. 

 In the course of a week the character of the responses changed. 

 Thus on May 17th the record is as follows: 



