SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 92, NO. 3, PL. 1 



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An Algal Spectrogram, Obtained by Exposing Plate 23 of 

 Chlorella vulgaris to Ultraviolet Rays for 4440 Seconds, Super- 

 imposed on a Diagram of the Intensities of the Wave Lengths. 



The abscissae are 



-iiutlis in ansstroms. The oriiinates are intensities in 

 ergs/sec. cm-. 



