CxROWTH OF BLOOD-VESSELS IN FROG LARVAE 



49 



on the left, with a continuous hunon, but without circulation, 

 and a fourth which ends blindly. The arteriole ends with a 

 bend to the right, from which a long thread extends to another 

 non-circulating vessel. Following the two branches to the right, 

 it is seen that the first pursues a winding course, while the sec- 

 ond passes fairly directly to the main venule or venous capillary, 

 near the right. Between the two branches are three communi- 

 cattng vessels, the last of which forms a non-circulating loop. 

 Below the venule there is a rather elaborate plexus of vessels 



APR 17 



APR 18 



