AtTTHORS ABSTRACT OF THIS PAPER ISSUED 

 BY THE BIBLIOGRAPHIC SERVICE NOVEMBER 3. 



FOOD-REACTIONS OF PELOMYXA CAROLINENSIS 



WILSON 



WM. A. KEPNER and J. GRAHAM EDWARDS 



University of Virginia 



FOURTEEN FIGURES 



CONTENTS 



I . Introduction 381 



II . Observations 383 



A. Reactions to objects without associated currents of water — not 



capable of retreat 383 



1) Objects giving off oxygen. 



2) Objects giving off carbon dioxide. 



B. Reactions to objects producing currents in water — capable of re- 



treat 385 



1) General examples. 



2) Example of change of physiological state on the part of both 



Pelomyxa and its prospective prey. 



3) Reversal of reaction. 



III . Discussion 393 



IV . Summary 398 



INTRODUCTION 



All food reactions of Pelomyxa involve movement. Ver- 

 worn, Rhumbler, Loeb and others have seen in the analogy be- 

 tween certain surface tension phenomena and the locomotion 

 of Rhizopoda suggested experiments of the manner in which 

 .certain Lobosa travel. Dellinger ('06) and Jennings ('06), 

 however, found that the movements of amoebae could not be 

 interpreted so as to be explained in this way. Jennings ('06) 

 says: "As our account shows, most amoebae do not move at 

 all as do liquid drops whose movements" are produced through 

 changes in surface tension," page 5. Quite recently Mast and 

 Root ('16) in an ingenious fashion have been able to show 

 that surface tension is "probably at best an insignificant factor 

 in the process of feeding in amoeba," page 48. 



381 



