THE FLY 33 



easily in the schoolroom. Expose out of doors a bit of 



lean meat, so that the eggs may be laid upon it. The 



blue-bottle fly will lay eggs upon meat. Fill a tin can 



or box with sand, and on a chip in the center of it 



place the bit of meat with the eggs on it. Invert a 



glass tumbler over it, and push the rim of the tumbler 



down onto the sand to prevent the 



escape of offensive odors. In a few 



hours the eggs will hatch, and in a 



few days the larva will be fully 



grown. They will probably crawl 



under the chip to change into pupaB. 



They may come out soon as adult 



flies, or they may remain over winter 



in this stage. The house fly lays PIG - n - THE FLT 



its eggs in manure and filth and is transformed through 



the same stages of life history. 



Rules Against Flies 



1. Flies are very dangerous in the spread of disease, 

 therefore we should not allow any decaying organic 

 matter in which they can breed to accumulate. 



2. If the cellar is damp clean out the dark and 

 damp corners and apply lime. 



3. Pour kerosene into the drains and also treat 

 with kerosene all waste materials not intended for fer- 

 tilizers. 



4. If the kitchen waste is deposited in large cans it 



