GROWTH OF BLOOD-VESSELS IN FROG LARVAE 



79 



Fig. 16 Vessels from a portion of the tail of Rana Pipiens larva from which 

 the heart was removed on April 27, before pulsations had started. Drawings 

 made May 6, 7 and 9 of same region of dorsal fin. A, B, C, D— indicate the 

 same blood-vessels. Lymphatics are dotted. 



