74 



TRIAL II. 



Conditions. — Date, January 17, 18 9; place, stove room; 1 oz. potas- 

 sium cyanide to 3,000 cu. ft.; in this room, containing 7,357.31 cu. ft. of 

 space, 2.45 oz. potassium cyanide, 5 oz. water, and 3f oz. sulphuric acid 

 were used; the room fumigated after dark, remaining closed until morn- 

 ing ; insects present were mealy bug, green My in abundance, and Fuller's 

 rose beetle ; plants present : Grevillias, ferns, dracaenas, palms, bananas, 

 pandanas, strelitzia, begonias in variety, mahernias, passifloras, Hoff- 

 mannias, allamanda, ivy, sausevieria, aristolochia, agaves, heliotrope, 

 cinerarias, callas, roses, etc. ; temperature, about 50° F., or a little above. 



Results. — Upon examination it was found no plants save the tender 

 leaves of the roses were injured, while the aphides on the Hoffmann ia 

 and elsewhere were killed. The other insects were apparently uninjured. 



TRIAL III. 



Conditions. — Date, January 20, 1899; place, camellia room; all night; 

 1 oz. cyanide of potash to each 2,000 cu. ft.; 3.09 oz. potash cyanide, 

 6.2 oz. water, and 4.6 oz. sulphuric acid used; insects present: aphides, 

 mealy bugs, Fuller's rose beetle; plants same as in Trial I. 



Results. — Aphides all killed and a part of the mealy bugs; none of 

 the older ones, however; no plants injured. 



TRIAL IV. 



Conditions. — Date, January 20, 1899 ; place, stove room ; all night ; 

 1 oz. potassium cyanide to each 2,000 cu. ft. ; 3.7 oz. potash cyanide, 

 7.4 oz. water, and 5.5 oz. of sulphuric acid required; plants same as in 

 Trial II, except roses; insects: mealy bugs and Fuller's rose beetle. 



Results. — Part of mealy bugs killed; old ones not killed; no plants 

 injured. 



trial v. 



Conditions. — Date, January 23, 1899; place, camellia room; 1 oz. 

 potassium cyauide to 1,000 cu. ft.; left in all night; 6.2 oz. potash 

 c> anide, 12.5 oz. water, and 9.1 oz. sulphuric acid; the room was warmer 

 than at other times, the temperature being over 50° F. 



Results, — In afternoon of January 24, 25 or more mealy bugs were 

 examined with a lens and all were dead. No injury to any of the 

 plants was seen. At this fumigation there w r as no heliotrope or eoleus. 

 The other plants, including carnations, were the same as in Trial I. 



TRIAL VI. 



Conditions. — Date, January 23, 1899; place, lily room; 1 oz. potash 

 cyanide to each 3,000 cu. ft.; left in all night; 1.76 oz. potash cyanide, 

 3.56 oz. water, and 2.64 oz. sulphuric acid required; temperature, 60° F. 

 or over; plants present, philodendrons, water lilies (Nyinplneas), parrot's 



