186 
Gardeners and Florists’ Annual for J9J8 
the grafting wax or clay may be removefi. Damp clay and fine straw 
mixed together so as to form a plastic compound, make a good medium 
for applying to the graft. Grafting wax is, however, handier and less 
troublesome, and is composed of wax mixed with pitch, resin and fat. 
Or resin, 4 parts by weight; beeswax, 2 parts by weight, tallow, one 
part by weight, melted and kneaded together. Indoor grafting of 
Hoses (on imported Manetti stocks) is usually done in January, the 
stocks being potted up in December. 
Greenhouse Measurement. — In order to find the surface area 
of any greenhouse add and multiply as shown in the diagram; 
In order lo find the cubical contents of a greenhouse multiply the length by the breadth 
by the height to the sill or gutter; then do the same from the sill to the ridge of the house 
but divide the sum of this latter computation by 2, when the result, added to the other 
total, will give you the cubical contents. 
Hydrocyanic Acid Gas is a powerful fumigant. Growers avail- 
ing themselves of this recipe are not only warned to use the greatest 
care in handling the cyanide of potassium (which in itself is a deadly 
poison), but to see to it that same is kept under lock and key until 
required; further, and most important, that the exact proportions pre- 
scribed be used, and that the condition of a dry house and a night 
temperature of not higher than 65 degrees be also present. For each 
3000 cubic feet of greenhouse space use: ll^ oz., 98 per cent, pure 
cyanide of potassium; 2% oz. sulphuric acid; SVs oz. water. Use a 
bowl-shaped, glazed earthen vessel in making the gas. When the house 
contains more than 3000 cubic feet, two earthen vessels should be em- 
ployed, using, however, the cyanide, acid and water only in the same 
proportion to the cubic contents as directed above; for example, in a 
greenhouse containing 6000 cubic feet of space use two earthen vessels 
with 1 % oz. of cyanide, 21/2 oz. of acid and 3l^ oz. of water in each; 
in a greenhouse containing 9000 cubic feet of space use three earthen 
vessels, with 1% oz. of cyanide, 21/2 oz. of acid and 3^2 oz. of water in 
each, and so on. Furthermore, it may be stated for convenience in 
using cyanide gas in greenhouses of different sizes where the space 
may not be exactly 3000 cubic feet or an exact multiple of that number, 
that the proportions to be used are V4 oz. of cyanide, V 2 of *ioid and 
