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HOW TO FUMIGATE PINEAPPLES WITH HYDRO- 
CYANIC ACID GAS. 
OUTFIT. 
1. — Air tight compartment large enough to hold a lot of pine- 
apples most convenient to the shipper. This compartment should 
have an opening at one side which makes the room air tight when 
closed. To provide for more rapid ventilation it is advisable to 
have another opening on the side opposite to the door, preferably 
near the ceiling of the chamber, also air tight when closed. Both 
doors should be arranged to open outwardly and from without. 
2. — i i-gallon crock. 
3. — 1 16 oz. graduate. 
4. — 1 postal scale. 
5. — Potassium cyanide, 98% pure. (Take none other.) 
6. — Sulphuric acid, commercial. 
7. — Water. 
OPERATION. 
In arranging the fruit in the fumigating chamber bear in mind 
to provide ample space for the crock so that, should sputtering 
take place m course of the chemical reaction, none of the chemi- 
cals drop onto the fruit. After depositing the fruit in the cham- 
ber weigh and measure out the chemicals in the following order 
and proportion for each 100 cubic feet of space in the chamber 
and pour into the jar (a) Water, 4 oz. liquid ; (b) Sulphuric acid, 
2 oz. liquid; (c) Potassium cyanide, 1 oz. by weight. (c) Is to 
be weighed out and broken into pieces about the size of a pea 
and held in a piece of paper in one hand and the door in the other ; 
when everything is ready quickly drop the cvanide out of the 
paper into the crock and shut the door. To insure against any 
one opening it, it is advisable to lock it. Leave the door closed 
from 45 to 60 minutes, then open for ventilation 
CAUTION. 
Bear in mind that the fumes are very poisonous and must under 
no circumstances be inhaled. 
The fumigation chamber, if the ventilation is good, must not 
be entered before a quarter of an hour has elapsed after opening 
the door, otherwise not less than half an hour must be allowed for 
ventilation. 
The Potassium cyanide should not be handled with bare hand 
if the latter is scratched or wounded in any way. Use gloves 
