Convenient handles for the crocks can be made of a large size® of 
wire. If properly arranged the ends of the handle will be held in 
position on opposite sides of the crock, otherwise they may cause 
considerable annoyance. 
MISCELLANEOUS REQUIREMENTS. 
Of the numerous articles of minor importance which sometimes 
are not easily obtained and should therefore be arranged for as early 
as possible are rubber gloves and glass graduates. Two or three 
pairs of rubber gloves ren be Sbtamed for a large outfit. One 
pair is needed for the one who measures the acid and generates the 
gas, and one pair should be available for use by the helper who 
empties the contents of the crocks after fumigating. The third pair 
should be on hand in case one of the pairs in use is lost or destroyed 
by any means. Rubber gloves can be purchased of or ordered 
through electrical supply houses or electric-light companies. Black 
rubber gloves with cloth lining are preferable to the red rubber 
gloves without lining which are sometimes used. The latter are not 
easily removed from the hands, especially after they become wet on 
the inside, and are on this account very troublesome. One should 
avoid gloves which are so thick that a wet glass graduate can not be 
easily handled when wearing them. 
A glass graduate of 16 ounces capacity is needed for each outfit, 
and if not obtainable of local dealers one or two extra ones should 
be always on hand. They can be purchased through local druggists 
or directly of wholesale drug houses. It is important that the num- 
bers on the graduate be plain and easily readable. 
Torches are preferable to lanterns, and if possible three or four 
of the former should be obtained. 
Balances, stoneware pitchers, dippers, water buckets, ropes, pul- 
leys, and other articles can usually be obtained of local merchants. 
CHEMICALS. 
The chemicals required in fumigation with hydrocyanic-acid gas 
are potassium cyanid (KCN) and sulphuric acid (H,SQ,) 
POTASSIUM CYANID. 
The cyanid ordinarily used in fumigating citrus trees is put up in 
200-pound cases and costs between 21 and 23 cents a pound in ton 
lots. It should be guaranteed to be 98 to 99 per cent pure. In 
calculating the amount of cyanid required, a tree should be selected 
which represents as nearly as can be estimated the average size of the 
trees in the grove. The distance over the top can be obtained by 
the tape measure in the same manner as described in connection with 
estimating the sizes of tents required. In addition to this measure- 
ment ae circumference of the tree should be qensuned with the 
aNo. 9 has been ieee ne ee authors for this purpose. 
[Cir. 111] 
