SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 107, NO. 17, PL. 6 



1. Opacity of ultraviolet-transmitting Glass to inhibitory 



ENAMATION from WOOD 



2, control: 3, 4, cultured in a single closed metal box containing wood. No. 

 3 was exposed directly to the wood, while No. 4 was further enclosed in a cell 

 with windows of Corning # 791 glass which transmits > 2200 A. (The prostrate 

 position of some of the shoots in No. 4 is due to their having been dislocated on 

 removal from the cell.) Photographed 4 days after planting. 



inhibition by Vapor from Wood 



I, control, aerated directly from compressed-air line; 2, exposed to air stream 

 which was first passed through can containing wood. Photographed 4 days after 

 planting. 



