. The American florist : a weekly journal for the trade. Floriculture; Florists. 572 The American Florist. Oct. IS, Fumlgatlog: With Hydrocyanic Acid Gas. The matorials necessary for fumiga- tion with hydrocyanic acid gas are potassium cyanide (9S to 99 per cent pure), commercial sulphuric acid, and water; and the utensils required are half-gallon or gallon stone, earthen or granite .iars and a supply of ordinary small paper bags. It is impossible to give a set formula prescribing the ex- act quantity of potassium cyanide to be used, says John J. Davis, assistant to the Illinois state entomolo
. The American florist : a weekly journal for the trade. Floriculture; Florists. 572 The American Florist. Oct. IS, Fumlgatlog: With Hydrocyanic Acid Gas. The matorials necessary for fumiga- tion with hydrocyanic acid gas are potassium cyanide (9S to 99 per cent pure), commercial sulphuric acid, and water; and the utensils required are half-gallon or gallon stone, earthen or granite .iars and a supply of ordinary small paper bags. It is impossible to give a set formula prescribing the ex- act quantity of potassium cyanide to be used, says John J. Davis, assistant to the Illinois state entomologist, in only for convenience in handling the cyanide when placing it in the jars, but also because they slightly delay the action of the acid upon it, thus giv- ing the fumigator ample time to leave the house before the reaction occurs. The jars being placed and the cya- nide properly weighed and bagged the next step is to close the ventilators in order to prevent all avoidable escape of the gas. The water—four fluid ounces to each avoirdupois ounce of cyanide —is then placed in each jar, the sul-. PLAN TO COMPUTE CUBIC FEET IN A GREENHOUSE. charge of greenhouse investigations, in a recent circular, owing to differences in the tightness of greenhouses. In those of average tightness I have used it on roses and cucumbers, without in- jury to them, at the rate of one ounce to 3,500 cubic feet of space. The number of cubic feet in the house should first be accurately calcu- lated. The methods of doing this may be illustrated by a simple computation on the dimensions given in the accom- panying figure, the understanding be- ing that the length of the house is 100 feet. The cubic contents of the rectangu- lar part of the house, a c d e, equals 24 X 6 X 100 = 14,400 cubic feet; that of the triangular part, a b x, equals 8 X 8 X 100 -f- 2 = 3,200 cubic feet; and that of the other triangular part, b c X, equals 8 x 16 X 100 -^ 2 = 6,400 cubic feet. The cubic contents of this house
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectfloriculture, bookyea
