238 FUMIGATION METHODS 
‘* One form of fumigating box in use by some of 
our nurserymen deserves notice. It consits of a 
smaller box resting inside of a larger one, about six 
inches of space separating the two between the bot- 
toms and about the sides, which is filled with loose 
sand or clay. The top is either constructed with a 
similar space filled in with sand or earth, or may be of 
the usual pattern double-boarded with tarred paper 
between. ‘This lid hasa rim of beveled inch-board six 
inches deep, projecting downward and falling into the 
sand above mentioned, being brought perfectly into 
place by a wooden wedge above. This produces a box 
that is absolutely air-tight, and can never have an 
unsuspected leak of any kind in it. 
‘‘ Judging from the evidence in my office, the gas 
treatment carefully applied is absolute protection 
against San José scale and other insect pests upon 
nursery stock. I have known instances where much 
nursery stock had gone forth infested when fumiga- 
tion was either not practiced at all or was carelessly 
done, but have failed to learn of a single case of 
infested stock going out from the same nurseries after 
the stock was carefully treated.’’ 
Idaho.—No experimental work with hydrocyanic 
gas has been done at this station. The question of 
infested nursery stock has not been a pressing one. 
In this state I knew of one infested nursery, but it 
was abandoned. ‘The owner made some inquiries of 
me about the subject of fumigation, and constructed a 
fumigating room, which he used for a year or two 
with success. As to fumigation of commercial 
orchards, there has been none of it here so far 
