1066 PHOCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 



3. Place the vessel containing the requisite quantity of water in 

 the small external gas-generating chamber. Add the acid to the water ; 

 never pour the water into the acid, or it will react violently and spatter 

 about. Take the weighed quantity of cyanide, wrap it loosely in a piece 

 of thin paper tied by a string of which one end is passed through the 

 hole in the top of the fumigation- chamber which is then closed up. 

 All being ready, the packet of cyanide is easily pulled up by means of 

 the string and dropped into the vessel of acid, and the hole on top of 

 fumigation-chamber corked up. Note the time. 



Quantities of chemicals required. 



For each Fumigation Box (100 cubic feet) : — 



Water ......... 1 fluid ounce. 



Sulphuric Acid . 1 „ ,. 



Potassium Cyanide (9S per cent.) .... Jounce 



For larger Chambers : — 

 According to size, at the rate of — 



Wafer , . . . 1 fluid our 



Sulphuric Acid . . . . 1 „ 

 Potassium Cyanide (98 per cent.) i ounce 



Per 100 cuhic feet of 

 internal capacity. 



■i. After three-quarters of an hour open the door or lid of the plant 

 and fumigatmg chambers, taking care not to breathe any of the gas 

 whilst doing so, and leaving them oj^en for at least a quarter of an hour 

 before making any attempt to remove the plants. The trays may then 

 be removed and the plants exposed to a current of air for another quarter 

 of an hour, after which they may be repacked. 



Note. — In all cases when an agent ot the consignee is in attendance, the unpacking 

 and repacking of the plants will be done by such agent. 



Cautions. 



1. Living plants miist not be watered immediately before fumigation 

 as wet foliage is liable to be injured by gas. If received wet, they should 

 be allowed to dry before fumigation. 



2. After fumigation plants should be protected from the sun for 

 several hours, preferably until the following morning. Do not therefore 

 spread plants out in the sun's rays after fumigation to dissipate the gas. 

 It is better to carry out fumigation at night if possible. 



3. Sulphuric Acid is strongly corrosive and will burn into the skin, 

 flesh or clothing. If acid should accidentally be spilt on to the hands, 

 plunge them immediately into a bucket full of water. If acid should be 



