GROWTH OF BLOOD-VESSELS IN FROG LARVAE 



51 



seen that in figure (j and 7 the no n- vascular zone toward the mar- 

 gin of the fin has become much reduced in .extent by the forma- 

 tion of new vessels, until only a very narrow non-vascular zone 

 is left. It will also be noted that there has been a general expan- 

 sion of the tail, so that the meshes between the vessels are not- 



A ^ R 2, 



