RECENT WORK WITH HYDROCYANIC ACID GAS 211 



AI^EN'S FUMIGATION TABLE FOR NEW SOUTH WAIVES 

 ORCHARDS. Continued 



23 



7,188 

 7,515 

 7,842 

 8,168 

 8,495 

 5,357 

 5,714 

 6,071 



oz. 

 34 



40^ 

 42 



oz. 

 34 



8* 



30 



oz. 

 102 

 106 

 112 

 117 

 121 

 126 

 79 

 85 

 90 



6.785 

 7,142 

 7,500 



7,857 

 8,214 

 8,571 



oz. 

 32 



86 



41 

 4214 



41 



oz. 



96 

 100 

 106 

 112 

 117 

 123 

 127 

 133 

 138 



As a final caution, Mr. Allen says the full height 

 and width of the tree should be taken after the tent is 

 in place. Give a full charge of chemicals; it is better 

 to give a fraction of an ounce too much than too little. 

 Especial attention is called to Fig. 76, reproduced from 

 Mr. Allen's report. For full directions for making 

 and applying the gas, see Chapters II. and V. to X., 

 inclusive. 



Orchard work in Cape Colony, South Africa. The 

 fumigation of orchards in Cape Colony is largely due 

 to the work of Prof. Charles P. Lounsbury, the Gov- 

 ernment Entomologist. The methods followed are 

 very similar to those used in California. The condi- 

 tions, however, governing the citrus industry of 

 southern California are somewhat different from 

 those found in Cape Colony. In California the black 

 scale is one of the principal pests against which fumi- 

 gation is conducted. This insect is practically un- 

 known to the colonial fruit growers, and where it does 

 exist it is kept in check by natural enemies. In point 



