Ak\ 



Journal of the Department of Agriculture. 



tackles are iheii allowed to run out, tlie poles fall, and tlu- rloth drops 

 in place. 



The catch-places on the slieei are made ef[uidistant from the 

 middle, not qiiite so far apart as tlie width of the tree, and from 

 four to twelv<> feet hack from the fiont edpe, according to the size of 

 the sheet and other circumstances. The (loth is simply gathered 

 about a wad of clotli, a green orange, oi' other rounded, soft hody, and 

 a hitch made hack of the lump thus formed with a short loop of rope. 

 The hook of the swinging block takes the free end of t'nV h)Oj). 











FlO. ^.--Jhtiiir l-'uiii'ifiation Curprx.- Sketches td -Imw Imw one is ]il,-i<'e(l dver :i tree. 



Otiui- /u/iiij)iiienf Required. — Pleasure glasses grachil for fluid 

 ounces aie needed for measuring the water and a( id. They are easily 

 broken, so it is well to have several. Four, ten, and twenty ounce 

 sizes are usually the most convenient. Most chemists stock measure 

 glasses. 



Ordinary kitchen scales and weights, with the pans piotected by 

 paper, do well enough for weighing out charges of cyanide of more 

 •' '■ ■ ^ ^-^ - " ' 'etter-bitlances are 



than a few 

 su]^eri(.i 



ounces. Tor verv 



charo'e 





FiG.'.l. Slwet CiiriT and l)rrrU-k Poles. — Sketches td shnw how a sheet is pljicod 

 (iver tree with derrick poles. A, poles and sheet in first position : /A polos 

 raised and. tackle connected: (\ sheet raised to top of tiee and ready for 

 pidiiiii:- toi'waid : D, sheet eoin|iletely over and poles in final position. 



Jjantenis, lantern rests, spades, buckets, a hammer, an enamel 

 funnel, an enamel jug for temporarily holding acid, and air-tighi 

 tins for similar use with cyanide, are all more or less necessary and 

 may have to be provided; also cloth and sail needles and twine for 

 use in ])atcliing covers. A (iO-foot tape line is needful for measuring 

 the trees. 



Measunuij the l' tee for Dosage. — The ai)proximate size of a tree 

 covered for fumigation may be judged by measuring the height and 

 diameter as with a marked pole, but the element of erroi is less if the 

 determination is based on the distances around and over the tree, and 



