f~iq./5 Leaves of Rhododendron 



f 



F~io. /. Laboratory Apparatus 



PLATE VII. 



Fig. 15. Leaves of Rhododendron growing at region 1, Aliquippa district, 

 showing how the leaves die from the tips back. 



Fig. 16. Shows a view of the apparatus used in the laboratory to experi- 

 ment with etiolated seedlings. 



