220 CAREY P. McCORD AND FLOYD P. ALLEN 



Effect of pineal gland upon melanophores of other forms'^ 



Pineal gland extracts have no demonstrable effect on either 

 type of chromatophore of Loligo (squid) or upon the melano- 

 phores of adult Fundulus. The extracts however determine 

 distinct contraction of the melanophores of young Fundulus 

 as may be noted in accompanying table. 



Mode of absorption of the pigmentation altering principle 



Several experiments were tried with the object of showing 

 whether the pineal tissue must be ingested or not in order to 

 produce the reaction. 



^ Experiment conducted by A. Noble at Woods Hole, Mass. 



