8 BULLETIN 872, U. S. DEPARTMENT OF AGRICULTURE. 



GOOD CONSTRUCTION. 



If walls and ceilings are smooth and well painted or whitewashed, 

 they are kept clean more easily, and offer no places for flour to lodge 

 or insects to breed. Rough stone or brick walls (fig. 5), or those 

 made of matched boards (fig. 6) offer many hiding and breeding 

 places. Floors should be of concrete, where this is possible, for board 



^y floorings offer shelter, 



Q ,,**' unless unusually well 



constructed. Floors and 

 walls should be so joined 

 that there is no opportu- 

 nity for accumulations 

 along sides and corners. 

 Well-cemented basements 

 that are light and dry are 

 an aid. 



Machinery should be 

 placed high enough to 

 allow frequent and thor- 

 ough cleaning beneath it. 

 Where practicable the 

 bottoms of flour conveyors 

 should be of metal and 

 rounded, so as to permit 

 the least amount of flour 

 or meal to accumulate 

 along the side and at the 

 ends. The hoppers of 

 the rolls should be con- 

 structed of cement and in 

 such manner as to allow no flour to accumulate in inaccessible 

 places. 



USE OF LIME. 



A liberal use of air-slaked lime in dark corners of damp basements 

 will not only serve as a repellent to insects^ but will also tend to 

 destroy some of the objectionable odors and sweeten the air. 



CARE OF SACKS AND BAGS. 



New sacks and bags should not be stored in packing rooms or in 

 any place where they become dusted with flour or cereal products, 

 for in this flour dust various mill pests can breed and become 

 established ready to attack stocks packed in the sacks. This is an 

 important point often oA T erlooked. Secondhand sacks should never 



Fig. 4. — Elevator and belt brush for cleaning ele- 

 vators infested by the Mediterranean flour moth. 

 It is made by taking a piece of lj-inch board of 

 same dimensions as elevator cups, fastening 

 bristles to three sides. Side A is fastened to 

 elevator belt with flat-headed bolts running 

 through board, as shown at BB, the bolts being 

 I or 1 inch. Bristles on sides CC should be 1-inch 

 long, but those at D should be longer, so that a 

 good brushing to outside of elevator may be 

 secured. Such a brush can be made to fit any 

 elevator. (Chittenden.) 



