/ 



Fig. 4 Experiment S. W. 47. Cell from medullary cord with two processes 

 attached to crossed web fibers. X 300. 



Fig. 5 Preparation S. W. 53. Bipolar and tripolar cells from medullary cord 

 attached to spider web fibers two days after explantation. X 300. 



Fig. 6 Experiment S. W. 39. Similar preparation eight days old. X 300. 



Fig. 7 Experiment S. W. 49, showing the two types of pigment cells; six days 

 old. X 300. 



533 



