306 LIGHT AND LIFE 



understand more concerning the fluorescence of luciferin, and the 

 effect of ionic environment and other factors upon the fluorescence. 



Acknowledgments 



This research has been supported in part by grants from The National Science 

 Foundation and the Graduate Research Board, University of Illinois. We are 

 grateful to Dr. L. Provasoli, of the Haskins Laboratory, for the culture of 

 Gonyaulax monilata, and for helpful suggestions in the preparation of artificial 

 sea-water media. 



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DISCUSSION 



Dr. Strehlf.r: We agree in most particulars with the picture Dr. McElroy 

 has outlined in his presentation. There are, however, three points I should 

 like to make. The first is that molecular oxygen does not appear to be a 

 universal requirement for bioluminescences. Even though most light-produc- 

 ing forms re(|uire oxygen, several species have been studied by the late Dr. 

 E. N. Harvey which yield bright luminescence even under the most strictly 

 anaerobic conditions for sexeral hoius. I refer partidilarly to his .studies 



