78 



TRIAL XVII. 



Conditions. — Date, March 2, 1899; place, second octagon room; 1 oz. 

 cyanide to each 3,000 en. ft. ; left in all night ; 8.5 oz. cyanide, 17 oz. water, 

 and 13 oz. sulphuric acid used; temperature, 57° F.; insects: "green 

 iiy " and mealy bug. It was found that a large number of mealy bugs 

 had been destroyed by the fumigation of February 15, 16, and 17, but 

 some remained. 



Results. — " Green fly" all killed. Of 10 mealy bugs examined 7 were 

 dead. It is possible that a part of this number remained on the plant, 

 dead from the previous fumigation. The younger ones were the ones 

 generally killed. The roses and solanum were injured as usual. 



TRIAL XVIII. 



Conditions. — Date, March 2, 1899; place, first octagon; 1 oz. cyanide 

 to each 3,000 cu. ft.; left in all night; 9.5 oz. cyanide, 19 oz. water, and 

 14.2 oz. sulphuric acid required; temperature, 53° F.; insects : mealy 

 bugs; plants: palms, veronicas, cytisus in bloom, oxalis, asparagus, 

 cyperus, ficus, oranges, mahernia, vincas, cupheas, Spircea ja/ponica, 

 marantas, etc. 



Number. 



House. 



Date. 



Time. 



Temper- 

 ature. 



Condition. 



Space. 



Trial I 



Trial II 



Experiment 1. 



Experiment 2. 



Experiment 3. 



Experiment 4. 



Experiment 5. 



Experiment 6. 



Experiment 7. 



Trial III 



TriallV 



Trial V 



Trial VI 



Cactus room 



Stove room 



Propagating greenhouse. 



Glass box 



do 



Nov 



do.... 



do 



do 



do.... 



do 



Rose room 

 Octagon . . . 

 Camellia. ., 

 do ... 



Nov. 16 

 Nov. 27 

 ...do... 

 Nov. 28 

 Nov. 29 

 ...do... 

 ...do ... 



Nov. 27 

 Nov. 29 

 Dec. 4 

 ...do... 



Min. 

 30 

 30 

 30 

 30 

 25 

 20 

 20 

 25 

 25 

 30 

 25 

 30 

 30 

 30 



°F. 



Raining ... 



60 



do 



Daylight ... 



Sunlight.... 



Darkness ... 



do 



do . . 



63 

 55 

 47 



47 

 45 



do 



.....do 



63 



60 



Darkness ... 



do 



do 



55-60 



do 



Cubic feet. 

 7, 076. 25 

 7,357.31 

 22, 729 



42 



42 



42 



42 



42 



42 



42 



4, 894. 37 



25, 689 



6,196 



6,196 



Number. 



Rate, 1 

 ounce to- 



Potash 

 cyanide. 



Water. 



Acid. 



Results. 





Feet. 



Ounces. 



Ounces. 



Ounces. 





Trial I 





'40 

 40 

 80 



40 

 40 

 80 



70 

 70 

 120 



Insects killed ; no injurv to plants. 

 Do. 







Trial II 



285 



Plants injured; insects killed. 







Grams. 



C. c. 



C. c. 



Experiment 1.. 



570 



2.1 



2.1 



2.1 



Insects mostlv dead ; all plants injured. 



Experiment 2.. 



285 



4.2 



4.2 



4.2 



Insects killed; no injury to plants. 



Experiment 3.. 



190 



6.3 



6.3 



6.3 



All but beetles killed; no injury to 

 plants. 



Experiment 4.. 



190 



6.3 



6.3 



6.3 



Do. 



Experiment 5.. 



190 



6.3 



6.3 



6.3 



Do. 



Experiment 6.. 



142 



8.4 



8.4 



8.4 



All insects and some beetles killed; 

 plants uninjured. 



Experiment 7.. 



190 



6.3 



12.6 



9.45 









Ounces. 



Ounces. 



Ounces. 





Trial HI 



570 



86.3 



86.3 



152 



Tender buds injured; insects killed. 



Trial IV 



175 



147 



147 



147 



Satisfactory. 



Trial V 



190 



34 



68 



34 



Not whollv satisfactory. 



Trial VI 



190 



37 



68 



51 



Satisfactory. 





to 99 per cent p 



