Bui. 36, Bureau of Plant Industry, U S Dept of AgtScultui^. 



Plate III 



JULIUS BIEN & CO.LITH.N Y. 



Color changes in Leaves of the BullPine 



1. Leaves rram healthy tree. 2. Leaves from "SorreL-top " tree. 

 3 CLTLcL 4. ZecLves fy-om trees turrting of the "Red-top" sta,ge. 



