60 FLOUB MILLS AND STORES. 



" 3. Under no circumstances sell this material to other dealers, 

 whether to mills or produce-stores, but have it treated with boiling 

 water or steamed, and fed to pigs. 



"4. "Where webs have appeared, either in the packages of meal 

 and flour, in the bolting-cloths and carriers, or in deposits of dust on 

 ledges, along the walls, &c., it may be deemed certain that the larva 

 has taken on the chr3'salis stage. Hence it becomes necessary to 

 make a close search in all these places for the cocoons, or little masses 

 of flour glued together, of say three-quarters of an inch in length. 

 These swept down can readily be gathered up and burned. 



" It has, however, been already pointed out that, owing to the habit 

 which the larva has of retiring to some crevice, when not hidden in a 

 package or deposit of flour, before passing into the chrysalis stage, we 

 find them in innumerable places quite impossible to be reached by 

 any brusliing-down process. Two ways only are left for overcoming 

 this difficulty. The one that first suggests itself is that of waiting 

 till the chrysalis is burst and the moth appears, and then kill 

 the moth. 



"This doubtless maybe followed by good results, i.e., have the 

 first moths appearing destroyed by hand, and by subjecting the affected 

 portions of a mill or buildmg to repeated treatment with the fumes of 

 burning sulphur every night when the works stop. If this is 

 persistantly followed out, but little development of new forms will take 

 place. It must be remembered that this work must be persistent and 

 thorough ; abundance of sulphur, burnt again and again, being the 

 sufficient condition of success. 



" Where, however, the larvae have, as it were, gained possession of 

 bolting-cloths and carriers, treatment with steam under pressure driven 

 throughout all parts of the bolting-cloths, carriers, and other machin- 

 ery, has been found very useful in lessening the inconvenience from 

 the spinning of webs, and thereby the clogging of the machinery. 

 The walls, floors, and ceilings may further be treated with advantage 

 by first brushing down all dust, and thereafter spraying them with a 

 solution consisting of a drachm of corrosive sublimate to each gallon of 

 water, by means of a gardener's force-pump. Treatment by fumes from 

 burning sulphur while parts are yet moist from this washing-down, will 

 greatly aid the destruction of any larvte or cocoon forms which may be 

 reached." — See 'Bulletin,' pp. 12-14. 



" Xoti'. — To prepare sulphur fumes : place a metallic dish containing 

 hot ashes on some support in a pan of water, or place in an old pan or 

 other vessel a bed of ashes, at least six inches deep and about fifteen 

 inches in diameter, and place the sulphur and saltpetre in a slight 

 depression in the centre and ignite. The proper proportions are three 

 pounds of sulphur and three ounces of saltpetre per thousand cubic 



