OX THE CAUSE OF AUTOTOMY IN TUBUI ARIA. 395 



I am much indebted. My best thanks are due to Professor 

 Paul Mayer, of the Zoological Station, for special apparatus and 

 for very main- kindnesses. For other support of this work I am 

 further indebted to the Laboratory of Experimental Therapeutics, 

 The University of Chicago. 



NAPLES, 



March, 1911. 



