OHZBHTATIOBS ABB PHOTOTROPISH8 IB FUCU8 ABB TOLTOZ 

 WITH HDBOCHHOJI&21C LIGHT OF XQUAL IH7HB8ZTZB8. 



ABBIB 



Submitted in partial fulfillment of tb requirements 

 for the degree of Doctor of Philosophy. 



University of California. 



April 26, 1916. 



