SUMMARY 455 



primary reactions has come out of the bacterial systems which can be 

 manipulated in such a way as to make interpretations easier. 



Well, I think last night I tipped my hand a little, by telling you all 

 the final moral for this speech, but let me repeat it: Don't let your 

 theories interfere with your practice. 



Thank you. 



Note added ill proof (page 452), Recently, L. R. Blinks and C, B, 

 van Niel have shown that in R. rubritm there is no enhancement 

 either of photosynthetic rates or of photosynthetic anaerobic 

 growth when cultures are exposed to simultaneous light beams of 

 different wavelengths, (vide pp. 291-309, Microalgae and PJioto- 

 synthetic Bacteria, ed. Jap. Soc. Plant Physiology. Univ. of Tokyo 

 Press, 1963.) 



