76 



Results. — Ou the morning of the 16th our eat was found dead upon 

 the walk near the entrance. She had evidently walked in the open 

 door the night before, when I went in with the cyanide, and must have 

 been killed in a short time. On the 18th 25 mealy bugs were examined 

 with a lens and 18 were found dead; but this is not a correct percent- 

 age of those killed, for many of the dead ones on the plants were 

 washed off by syringing the house previous to examination. Tbe 

 climbing roses, the tender leaves of the Solatium jasminoides, the new 

 leaf buds of Pleroma macranthum, the new fronds of Pteris tremula, 

 and the new shoots of 'Asparagus tenuissimus were all more or less 

 injured. The other plants showed no injury. 



TRIAL X. 



Conditions. — Date, February 15, 1899; place, stove room; left in all 

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

 7.4 oz. water, and 5.5 oz. sulphuric acid required; temperature, 55° to 

 60° F. ; insects : mealy bugs and aphides. 



Results. — In this room there was no injury to plants; all of the 

 aphides were killed, and all mealy bugs examined were dead. This 

 house was also fumigated with the same proportions on January 27. 



TRIAL XL 



Conditions. — Date, February 16, 1899; place, vegetable house, west; 

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

 56° F. ; 2 oz. cyanide of potash, 4 oz. water, and 3 oz. sulphuric acid 

 required; insects: an abundance of u green fly'',* plants present: let- 

 tuce, radishes, papyrus, smilax, cinerarias, kale. The lettuce and cin- 

 erarias were badly covered with "green fly." 



Results. — Ail or nearly all "green fly" killed, even under the lower 

 leaves of the lettuce, which had commence to head. There was no 

 injury to plants. 



TRIAL XII. 



Conditions. — Date, February 23, 1899; place, the pit; 1 oz. cyanide 

 of potash to each 3,000 cu. ft. ; left.in all night ; 3 oz. cyanide of potash, 6 

 oz. water, 4J oz. sulphuric acid required; temperature, 47° F.; insects 

 present: mealy bugs and "green fly"; plants: cinerarias, calceolarias, 

 pelargoniums, geraniums, muehlenbergia, eupatoriums, nasturtiums, 

 clematis, etc. 



Results. — The aphides were nearly all killed, while the mealy bugs, 

 the older ones at least, were not injured. There was no injury to plants. 



TRIAL XIII. 



Conditions. — Date, February 28, 1899; place, camellia rOOin; 1 oz. 

 cyanide of potash to each 1,000 cu. ft. ; left in all night; temperature, 50° 

 F. ; 6 oz. cyanide of potash, 12 oz. water, 9 oz. sulphuric acid used ; plants 



