Cyanide Gas Remedy for Scale Insecj's. 



441 



They take less cloth thini slieets, but fur use on trees over 6 feet higli 

 they require the addition of a iiu<y of piping to keep the moutii 

 distended, and they aie mucli more difficult tlian slieets to enlarge it 



Fig. 1. — Clof/i fur Fuiiiiij((thin ('ucerx. — Sketch l<i shu 

 wuavL' (if desiniljle type iif duck. 



iniiLstraUuii III/ II. S. Wo'jlum.) 



the trees outgrow tiieni. 11 is n)o]c ditticult to get them iha(h' than 

 sheets, and they are too cumbersome for trees over 12 feet bi."'h. 



rs ^£> 



KlC 2. — {'/(ifh t'or Fiinii(j((tinn CovevH. — Sketch to shi. 

 weave ot iiudesii-able type of duck. 



i Illustration, bii U. S. W'oijhnn.) 



Clotli for Covers. — Ordinarily water-shrunk covers are used. In 

 the dosage tables given hereunder, it is assumed that the covers will 

 be water-shrunk and made of a closely woven cotton cloth that for 

 trees up to 12 feet high and 12 feet wide weighs 12 ounces or more 



