PLATE 1. 



Box for treating trees with liydrocyauic acid gas. Fig. 1. Box 

 ready to be filled with trees. Fig 2, Box filled, inverted and 

 banked with earth ready to have generator inserted. 



PLATE 11. 



Tank for dipping trees in whale oil soap solution. 



(Drawn and photographed by F. A. Sirrine.) 



