AUTHORS ABSTRACT OF THIS PAPER ISSUED 

 BY THE BIBLIOGRAPHIC SERVICE, JUNE 24 



LIGHT REACTIONS AND METABOLISM IN MAY-FLY 



NYMPHS 



I. REVERSALS OF PHOTOTAXIS AND THE RESISTANCE TO POTASSIUM 



CYANIDE 



II. REVERSALS OF PHOTOTAXIS AND CARBON DIOXIDE PRODUCTION 



W. C. ALLEE AND E. R. STEIN, JR. 



Lake Forest College 



FOUR CHARTS 



CONTENTS 



I. REVERSALS OF PHOTOTAXIS AND THE RESISTANCE TO POTAS- 

 SIUM CYANIDE 



Historical .' 512 



Ecological notes ■ 513 



Methods 514 



Reversals of phototaxis 515 



Does resistance to potassium cyanide measure the rate of metabolism in May- 

 fly njonphs? 516 



Relation between the sign of light reaction and resistance to the cyanide. . 518 



1 . Epeorus 518 



2. Leptophlebia 520 



II. REVERSALS OF PHOTOTAXIS AND CARBON DIOXIDE 

 PRODUCTION 



Methods 522 



Phototaxis and caAon dioxide production in untreated nymphs 525 



Experiments with hydrochloric acid 528 



1. Effect on negative nj^mphs 528 



2. Effect on positive nymphs 529 



3. Negative vs. positive nymphs; both treated with HCl 531 



Experiments with potassium cyanide 535 



Experiments with alcohol and strychnine ' 537 



Discussion 540 



Conclusions 544 



Literature cited 545 



423 



THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 26, NO. 3 



