GROWTH OF BLOOD-VESSELS IN FROG LARVAE 



67 



12 a 



12 b 



Fig. 12 Drawing to illustrate fate of an isolated portion of blood-vessel. 

 The portion A was cut through at the two points labeled X in drawing a. Two 

 days later (b) this isolated portion had formed a connection with the rest of the 

 blood-vascular system at B. 



