JOHN BUCK 709 



we have discussed, where so strong a case can be made for a functional, 

 if still undefined, association of eyes and photophoresJ 



•I have been much stimulated, in my speculations, by discussions with various 

 colleagues. Not to imply their endorsement, however, I must mention that their 

 attitude toward the reasonableness of tlic cvc-photophoic comparison is perhaps 

 epitomized by tlic following (paraphrased) question put by Dr. Rushton: "What 

 would you say if I were to attempt to convince you that the ear and the larynx 

 are mirror-image organs? They have the same sort of external funnel for sound 

 collection (dispersion), the same vibrating body for sound reception (production), 

 tiie same sort of devices for loosening and tightening the vibrator, and approxi- 

 mately the same frequency range." Actually, come to think of it, there might be 

 something in tlic idea. Consider, for example, that both ear and larynx develop 

 from gill pouches . . . 



An additional evolutionary facet, which I had missed completely, is brought out 

 in tlie following excerpt from a post-symposial letter from Dr. Wald: "I do think 

 that you ask too close an association of photophores and eyes in the same organ- 

 isms. I think that one of the most apparent uses of bioluminescence is to provide 

 light in the depths for organisms that can see, and that it matters little whether 

 these are the same or other organisms. Organisms, plant and animal, as you 

 know, form a community; and their interrelationships are so various and complex 

 that they quite commonly provide for one another, with ultimate advantage to 

 themselves. It is probably a fine thing for marine bacteria that fish get along well, 

 and this if nothing else w'ould be a fine justification for bacteria developing 

 luminosity." 



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