226 
three or four days; the liquid доно is then drawn off, and is ready 
for use without further preparation. Tents which I saw that had been 
prepared with this substance were to M emere as air-tight and 
descri 
completed about 60 dollars. Where the trees to be treated are not 
more than 12 feet tall the tent can be placed over them by means of 
poles in the hands of three persons ; to accomplish this, three iron rings 
are sewed to the tent at equal distances around, and 6 or 7 feet from 
the bottom of the tent; immediately under each of these rings an iron 
hook is attached to the lower edge of the tent. When the latter is to 
be placed over a tree each of the hooks is fastened into the corre- 
sponding ring above it ; one end of a pole is then inserted into each of 
these rings, and the tent is raised and placed on the tree. The hooks 
are then released from € rings and the lower edge of the tent allowed 
the tent allowed to rest upon it. By the use of this simple device the 
danger of breaking off the small twigs on the upper part of the tree by 
the weight of the tent is avoided. Mr. Leslie, of Orange, used four 
tents and tent rests of this kind, and he informs me that with the aid of 
two men he fum migated 120 trees in one night. To eti the tent 
. H. Dunn, of Pomona, informs me that four men, "ing six te ute 
like the above, fumigated 240 orange trees in one night, and that the 
average for each night was over 200 trees, the latter being 8 feet or less 
in height. After the tent is placed over the tree the next step is to 
charge it with the gas. The materials used for the production of the gas 
The tent is allowed to remain over the - for a period of from 15 to 
30 minutes, according to the size of the tr 
“It wasfound by experimenting that the trees, were less liable to 
be injured by the gas when treated at night than t they were s 
operated upon in day time, and at the same time the gas is just as 
to the scale insects when applied at night as it would be if applied 
i i it appears to be 
applied at night. This is accounted for by reason of the fact that 
in the day time the light and heat decompose the gas into — i 
[телге o meg more or less in a state of rest, and а пано 
