FIG. 1. DUSTED. Typical leaves from Northern Spy trees dusted with sulphur and lead areenate. 

 They are vigorous and free from injury. 



FIG. 2. CALCIUM ARSENATE. Typical leaves from Northern Spy trees sprayed with lime- 

 sulphur and calcium arsenate. There was considerable arsenical injury. 



FIG. 3. LEAD ARSENATE. Typical leaves from Northern Spy trees sprayed with lime-eulphur 

 and lead ar^enate. There was some injury but not so severe ae where calcium arsenate wae used. 



