ORGANIZATION AND GROWTH 



193 



roots. Light has no demon- 

 orientation of Antennularia. 

 one side only, the animals 

 and the same occurs also in 

 uli, however, affect the orien- 



strable effect upon the 

 Even when lighted from 

 continue to grow upward ; 

 the dark. 1 Contact stim- 

 tation. When the roots 



W 



stem with reference to the horizon, ab (Fig. 42) represents 

 a piece cut from the stem of an Antennularian ; a is the 



1 The specimen grew only slightly in the dark. This may, however, have hap- 

 pened only by chance. 



