DEAINAGE 



277 



To keep down flies the space between the top of the dwarf walls, sur- 

 rounding the dung, and the roof should be fly-netted, and fly-doors should 

 be fitted to give access to the dung-stead. Receptacles containing 

 poison bait, laid on top of the 

 dwarf walls, inside the fly- 

 netting, will also help to- 

 wards the abatement of the 

 fly nuisance. A few acacia or 

 eucalyptus branches hung on 

 the outside of the fly-netting, 

 and sprayed with poison bait, 

 will account for many of the 

 flies which are attracted to- 

 wards the dung-stead as a 

 suitable place in which to 

 deposit their eggs. The sill 

 of the fly-doors, which give 

 access to the dung-stead, 

 should be raised by about 6 

 inches above the impervious 

 floor of the dung-stead, so as 

 to present a vertical step 

 that will be an insurmount- 

 able barrier to fly maggots, 

 which naturally try to crawl 

 away from the manure in 

 order to develop into flies. 

 The dung, of course, should not be allowed to touch the step, but a clear 

 space between manure and " step-up " should be preserved. 



Failing the above rather elaborate arrangements, much can be done to 

 keep down flies by covering the dung with leafy branches sprayed with 

 poison bait. The bait should be prepared according to the following 

 formula, recommended by Mr. C. "W. Malby : — 



Arsenite-of-soda ... ... ... 6} ozs. (a v.) 



Sugar (cheapest grade) 4 lbs. 



"Water „.. 4 galls. 



Pig. 213. 



