FUMIGATION 



289 



an easy matter to determine the distance over the tent and the cir- 

 cumference at the ground. When these figures are known, the 



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Dosage chart for fumigating citrus trees (Bureau of Entomology, U. S. Dept. Agric.) 



proper dosage may be obtained from the above chart, which 

 has been prepared for a strength of one ounce of cyanide for 

 each 100 cubic feet of space, 

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