94 GENERAL BIOLOGY 



may be seen through the wall. In what direction is the 

 blood flowing? Further observations on circulation may 

 be made upon a worm, anesthetized with chloroform, which 

 has been opened to expose the bloodvessels. Observe the 

 contraction of the dorsal vessel and the hearts, also note 

 the delicate bloodvessels upon the various organs. 



