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 
