66 FUMIGATION METHODS 



applied in a block of infested pear trees the first and 

 second week in April, 1899. 



It requires three or*four men to operate an outfit 

 of this kind ; the help, of course, depending on the 

 number of fumigators in use. It requires one man to 

 look after the chemicals and time, and two or three to 

 handle the fumigators and rigging. With an equip- 

 ment of ten fumigators this force, under favorable 

 conditions, can in one day fumigate from one hundred 

 and seventy-five to two hundred trees, varying from 

 twelve to seventeen feet in hight. The cost of the 

 chemicals is about four cents for the eight-foot box 

 without the hood extended, five to six cents when the 

 hood is half extended, and six to seven cents fully ex- 

 tended. 



The cost of the large fumigator complete, as seen 

 in Fig. 32, is about $12, or about two-thirds that 

 of a twenty-five foot sheet tent sufficient 'for covering 

 a tree of the same size. The rigging for handling the 

 fumigators costs about $12. Taking it all in all, 

 this system is simple and can be used by the average 

 orchardist. 



In giving this method for handling hydrocyanic 

 acid gas to the public, it should be said that the author 

 has had the practical experience of Robert S. Emory, 

 of Maryland, without which it would not have been 

 possible to have completed the experiments and per- 

 fected the apparatus. The mechanical details were 

 under his entire personal supervision. As a slight rec- 

 ognition of his services and practical experience, this 

 apparatus has been named the ' ' Emory Fumigator. ' ' 

 The Miller type. The Emory fumigator has been 



