1939] 
SERVICE AND REGULATOR Y ANNOUNCEMENTS 
67 
and suspend a tray therein. Fill the 3-ounce measuring device with liquid 
hydrocyanic acid, and pour through the tube into the pan. Replace the plug and 
close the hatch cover tightly. Then repeat the operation in the ice bunker at 
the opposite end of the car. 
HCX discoids — The doors must be closed tightly and the ice drips properly 
plugged. Remove one insulating plug from each ice bunker. Open the can, 
remove one discoid unit and suspend it immediately in the bunker, holding the 
string at the edge of the opening and wedge it in position by closing and fasten- 
ing the insulating plug. The open end of the can must be covered with the 
fiber cap immediately after the unit is removed to prevent loss of gas. Then 
place the second discoid unit in the bunker at the opposite end of the car. 
Calcium cyanide. — The doors and the hatches must be tightly closed and the 
ice drips properly plugged. Open one door. Cover the trays with paper and 
apply 1V> pounds of calcium cyanide uniformly to the paper in each tray. Then 
place the trays on the load near the door of the car. Finally, close the door 
tightly. 
After the treatment is completed, open the hatches and place the screens in 
position and remove the plugs from the ice drips. Remove the pans and trays. 
Doors must be kept closed, unless an approved screen has been provided. 
XP) ETHYLENE OXIDE FUMIGATION 
Equipment. — A fumigation chamber, of approved design, equipped with 
vaporizing, air-circulating, and ventilating systems must be provided. 
Temperature. — The temperature must be at least 75° F. during the treat- 
ment. 
Dosage. — Two pounds for each 1,000 cubic feet in the chamber. 
Period of treatment. — Two hours. 
Varieties of fruit. — The varieties of fruit treated successfully by this method 
are given in Circular 373. 
Preparation of fruit. — The crates and baskets of fruit must be stacked in 
the chamber in such a manner that the gas will have access to all sides of the 
containers. 
Application. — After the chamber is loaded, the ethylene oxide must be vapor- 
ized in the pan in the chamber. The air within the chamber must be kept in 
circulation during the period of fumigation. At the completion of the treat- 
ment, the chamber must be well ventilated before it is entered and the fruits 
removed. 
METHYL BROMIDE FUMIGATION 
(1) Refrigerator cars 
Equipment. — Refrigerator cars must be in fair condition with sound, well- 
fitting doors and hatches. Standard cloth screens for covering the hatches 
and a temporary cloth screen for covering one door during ventilation are 
essential. An electric blower of not less than 750 cubic feet per minute capacity 
against 14 -inch water pressure, equipped with devices for lowering into the 
bunker and securing, so that the blower outlet butts against the bunker screen 
unimpeded either by studs or burglar bar. 
Temperature. — The temperature within the car must be at least 70° F. dur- 
ing the treatment. 
Dosage. — Two pounds for each 1,000 cubic feet; or 5 pounds per refrigerator 
car. 
Period of treatment. — Two hours from the end of the fumigant release period. 
Application. — The doors must be closed tightly and the ice drips properly 
plugged. The methyl bromide may be released either by weight or measure, 
through a copper or brass applicator tube of 14 -inch bore. This tube must be 
fitted with a disk-type spray nozzle and must be bent in a U -Shape at the end, 
so that the spray nozzle is directed upward toward the center of the bunker and 
not less than 1 foot below the ceiling during the release of the fumigant. The 
blower must be in continuous operation during the release of the fumigant and 
for 5 minutes thereafter. At the end of this period the blower may be removed 
and transferred to the next car. The fumigant must be released in a split 
dosage consisting of 3 pounds in the bunker end through the batch across from 
the blower and 2 pounds in t lie hatch at the opposite end of the car and in line 
with the blower. 
