ESTIMATING GAS FOR ORCHARD WORK SI 
On low, damp grounds where fogs are frequent, 
and especially for apple and pear trees, infested with 
either the San José scale or codlin moth, or old seedling 
orange trees infested with red, brown, or purple scale, 
the following table should be used: 
Saari FOR ORCHARDS ON DAMP GROUNDS OR WHERE 
FREQUENT FOGS OCCUR 
HIGHT Diameter Water Sulphuric Acid Cyanide 
Feet Feet Ounces Ounces Ounces 
1 1 
8 6 10 216 214 
10 8 14 4 4 
12 10 24 6 6 
12 14 36 9 9 
14 14 40 10 10 
16 16 48 11 11 
18 16 48 12 12 
20 16 52 13 13 
22 18 60 1416 1416 
24 20 64 16 16 
26 20 66 1614 1649 
30 2 70 17 17 
In the tables giver above the diameter is taken 
through the foliage. The water and acid are estimated 
in fluid ounces. 
In Eastern orchards the amount of cyanide is some- 
what greater than that used in California. Experience 
has shown that 0.20 gramme of cyanide per cubic foot 
of space enclosed gives most satisfactory results upon 
scale-infested deciduous trees in the East. 
In the preparation of the following table calcula- 
tions are based on the hight and diameter of the tented 
tree. First, the cubic contents of a cylinder was cal- 
culated, the hight and diameter of which was the 
hight and diameter of the tree, then the contents oi a 
sphere whose diameter was the hight of the tree was 
