4 INSECTS AFFECTING HEALTH OF MAN OR ANIMALS. 
in narrow windrows about 8 feet apart. After drying for a few hours 
each windrow is spotted with oil at intervals of 6 feet on the wind- 
ward side and fired. Thenext day the wagons straddle the windrows 
and dump the manure on the ashes of the previous day’s burning. 
It is necessary to rake the windrows in narrow rows to prevent burning 
the feet of the wagon animals. 
Where the accumulation of manure is too great or weather condi- 
tions render such a method impracticable, the following method 
might be tried: 
A long space about 12 feet wide should be marked off and all 
manure hauled to that area. The loaded wagons travel over the top 
of previous accumulations; in this way a large but compact and well- 
Fic. 2.—Larve, or maggots, of the house fly. About naturalsize. (Newstead.) 
shaped heap is built up. Driving over the top of previous accumula- 
tions packs it down tightly, and thus renders it unfavorable as a 
place for the breeding. If in addition to this the surface is treated 
every day or two with powdered borax, at the rate of three-fifths of a 
pound per 8 bushels of manure, the fly breeding will be very greatly 
reduced, if not entirely prevented. 
Another method of controlling the flies in heaps of manure is to 
spray the surface thoroughly with a solution of sodium arsenite and 
sugar made according to the following formula: One pound sodium 
arsenite in boiling water; add this to a solution of 10 pounds of 
brown sugar in 10 gallons of water. This operates against the 
adults, which are attracted and poisoned by the sweetened mixture. 
This spraying should be repeated at frequent intervals, so that 
there will be a supply of the sweetened poison on which the flies may 
