New York Agricultural Experiment Station. 313 



could be banked directly against the fumigator, making as close 

 a joint as when placed upon the sod-cloth. As the latter proved 

 to be very much in the way when moving the fumigator it was 

 removed. 



Cost. — The cost of building a twelve-foot fumigator, not in- 

 cluding labor of putting on cover and oiling of same was .f27, 

 while the cost of the smaller size was |22.37; hence the entire 

 cost of building such fumigators ought not to exceed |30 and 

 |25 respectively. 



Manipulation. — ^The method of using and handling the folding 

 fumigator after treating a tree was as follows: First, the front 

 lid of top was unhooked and turned back, the doors were opened 

 next and the front brace removed. By having the open-bar 

 staples placed at the proper height the poles used for carrying 

 the fumigator rested upon the workmen's shoulders, allowing 

 them one hand free for lifting branches or holding the doors 

 open. See Plate XVIII. After placing the fumigator around a 

 tree the charge of cyanide was placed in its receptacle, the 

 generator being placed beneath the latter; next, the brace was 

 replaced, the doors brought together, the lid closed and hooked, 

 after which the doors were hooked and base of fumigator 

 banked. See Plates XIX, XX and XXI. 



A light pole for unfastening hooks and opening lid proved use- 

 ful. With the aid of an anchor rope the same pole proved 

 handy for closing the lid especially on the twelve-foot fumiga- 

 tors. 



Whenever the wind was not too brisk and a fumigator had to 

 be moved but a short distance it was found unnecessary to use 

 the front brace. By the use of all braces and the addition of 

 anchor ropes the folding fumigators could be used on days when 

 the wind was too heavy for handling tents; they could also be 

 anchored and left standing in an orchard over night. 



With a set of four folding fumigators and five men, forty trees 

 could be fumigated in a day. In no case was the time of ex- 

 posure less than thirty minutes and in most cases it exceeded 

 forty-five minutes. With the four fumigators there were 



