author's abstract of this paper issued 

 by the bibliographic service, april 5 



THE EFFECTS OF HYDROGEN ION CONCENTRATION 



AND OXYGEN CONTENT OF WATER UPON 



REGENERATION AND METABOLISM 



OF TADPOLES^ 



MINNA E. JEWELL 



Zoological Laboratories, University of Illinois 



TWENTY-FOUR FIGURES 



CONTENTS. 



Introduction 461 



Materials 465 



Apparatus and methods 466 



Presentation of data 470 



Rengeneration in bases 472 



Carbon-dioxide production and regeneration in bases 476 



Regeneration in acids 483 



Carbon-dioxide production and regeneration in acids 490 



Relation of size to carbon-dioxide production and regeneration 493 



Regeneration in low oxygen 498 



Regeneration in low temperatures 502 



General discussion 503 



Summary 504 



Literature cited 506 



INTRODUCTION 



The direct influence of temperature upon the rate of devel- 

 opment has long been recognized, and has recently received 

 considerable attention, especially from the economic entomol- 

 ogists who are working upon the relation of weather conditions 

 to the time of emergence of insect pests. That other environ- 

 mental factors may similarly afTect development is also recog- 

 nized, but as yet the literature is meager. 



* Contribution from the Zoological Laboratories, University of Illinois, no. 153. 



461 



