544 
Do not handle a clean tree after having examined a diseased 
one, without previously washing your hands, as the eggs and larve 
of some of the scales are so small that they are easily carried from 
one tree to another by the growers themselves, or their men. Ihave 
“often seen people crush scale insects on branches of trees, between 
their fingers, and then go to the adjoining tree and carelessly handle 
it and examine it for scale. Trees infested with the San Jose and 
the more dangerous sorts of scales should not be handled unless it 
is found necessary to do so. 
FuMIGATING OUTFIT 
consists of gas-tight tents made of light, strong canvas, cut and 
sewn together in a bell shape, and painted with raw linseed oil, 
A little turpentine added to the oil will cause it to dry quicker. 
When painting, spread the tent well by hanging it to the rafters of 
a shed or the branches of a tree, and leave it to dry thus spread out, 
lest the tissue of the canvas should heat and rot. Calico is rather 
a light material for the manufacture of tents ; it wears badly, and 
requires constant patching up. Eight-ounce duck or ordinary blue 
or brown drilling, sewed carefully, are good materials. It is ad- 
visable to have rings at the sides and top of the tent, to ease it over 
trees by means of a light pole with a fork at the end. A light $-inch 
gas piping hoop, rung through rings at the base of the bell-shaped 
tent, is found convenient for covering and uncovering trees, and for 
keeping the tent stretched out. At the base of the tent, and below 
the ring, a gas-tight flange or canvas collar, about a foot wide, is 
provided, and rests on the ground. After the tent has been charged 
this canvas collar is slightly banked up all round with earth, to 
prevent the gas escaping. 
Before fumigating, inspect the tents. No hole, however small, 
should be allowed to go unpatched. 
Trees too large to be covered with a tent may be fumigated 
under a large gas-tight canvas sheet. 
Also provide yourself with : 
Ist. A common earthenware basin, 6 to 9 inches wide, accord- 
ing to size of tent or tree. 2nd. Scales for weighing 
the cyanide of potassium. 3rd. A graduated glass 
for measuring the fluid ounces of sulphuric acid and 
of water. 4th. If a gas-piping ring is not provided 
to keep the tent spread out at the base, have an 18ft. 
light pole, with rope and pulley, to hoist the larger 
tents over the trees. 5th. Sufficient number of loz. 
packets of cyanide of potassium, 98 per cent. purity, 
which must be kept in an air-tight jar. 6th. Sul- 
phuric acid in a bottle with « glass stopper. 7th. 
Water. 
