Value of Arsenic as an Addition to Kerosene Enmdsion. 201 



one pound in 55 gallons wash. Emulsion one part ; water fifteen parts. Ap- 

 plied August 30 on Aspidiotus sp. on currant. September 7, leaves of plant 

 all dry ; a few of the scales still living ; also, eggs.and newly hatched young 

 found. October 7, all scales dead ; plant in good condition. November 22, 

 no living scales can be found. December 17, no living scales on plant. 



EXPERIMENTS WITH RESIN COMPOUND AND ARSENIC ACID. 



Experiment 185 — Resin compound and arsenic acid, of which one pound 

 in 85 gallons wash. Compound one part; water sixteen parts. Applied 

 September 2 on Locanium hesperidum on orange. [All orange trees experi- 

 mented on were in poor condition, received no water during summer, and 

 leaves were curled.] September 7, most of the young and tender shoots 

 destroyed, a few leaves falling ; scales appear to be dead. September 13, 

 scales all dead ; leaves still falling, only few remaining on tree. November 

 22, no living scales; tree growing, full of young shoots, but very few of the 

 old leaves remaining. December 17, found four young scales, which evi- 

 dently have come from neighboring trees; tree in good condition again, 

 still growing. 



Experiment 186. — Resin compound and arsenic acid of which one pound 

 in 90 gallons wash. Compound one part; water eight parts. Applied Sep- 

 tember 2 on' L. hesperidum on orange. September 7, scales dead, found a 

 few living young under mother scale ; a few leaves falling. September 13, 

 all scales dead ; about half of the leaves have fallen. October 7, no living 

 scales. November 22, about one-third of the leaves remaining ; tree other- 

 wise in good condition. December 17, tree in good condition ; no living 

 scales. 



Experiment 187 — Resin compound and arsenic acid, of which one pound 

 in 100 gallons wash. Compound one part, water four parts. Applied Sep- 

 tember 2 on L. hesperidum on orange. September 7, scales all dead. Sep- 

 tember 13, no living scales; about one-quarter of the leaves have fallen. 

 October 7, tree in good condition, not injursd beyond the loss of a few leaves ; 

 all scales, lichens and fungus destroyed. November 22, tree in very good 

 condition; no living scales. 



Experiment 189— Resin compound and arsenic acid, of which one pound 

 in 170 gallons wash. Compound one part, water sixteen parts. Applied 

 September 13 on L. hesperidum on orange. October 7, many scales still living; 

 nearly half of the leaves have fallen. November 22, all scales dead; tree in 

 good condition. December 17, no living scales on tree. 



Experiment 190— Resin compound and arsenic acid, of which one pound 

 in 200 gallons wash. Compound one part, water four parts. Applied Sep- 

 tember 13 on L. hesperidum on orange. September 21, scales nearly all dry; 

 no leaves whatever have fallen. October 7, scales all dried up ; no leaves 

 have fallen. November 23, no scales on tree, which is in very good con- 

 dition. 



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