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carry the kerosene down into it. September 7, on examination most of 
the larve were found to be dead. About 20 per cent, however, were still 
alive. The manure was then turned. On September 8 about as many 
were still living as on the previous day. 
Experiment 5 (kerosene).—On September 7,8 quarts of fresh horse 
manure containing house-fly larve were placed as before in a tin pan, 
sprayed with 1 pint of kerosene, washed down afterwards with 1 
quart of water. The manure was then rather thoroughly mixed and a 
little more water was poured on. The treatment was tbus identical 
with that in experiment 4 with the exception that the manure was 
stirred after the kerosene spray had been washed in. On September 8 
every larva in the mass was dead. The first examination showed not 
a single survivor. 
Bauperiment 6 (chlorid of lime).—October 15, mixed 1 pound of chlorid 
of lime with 8 quarts well-infested horse manure. Kept in bucket. 
October 16,nearly 90 per cent of the larve were dead, the remainder 
having burrowed into the large lumps of manure. October 18, no 
living larvee could be found. 
EHaperiment 7 (chlorid of lime).—October 21, mixed one-fourth pound 
with 8 quarts rather sparsely infested fresh horse manure. Kept in 
bucket. October 22, careful examination showed only two dead larve. 
Many were seen which were apparently unaffected. October 23, no 
dead ones were found. October 25, no dead ijarve found; all larve 
had hardened into apparently healthy puparia. 
CONCLUSION AND GENERAL REMARKS. 
Experiment No. 5 indicates an easy and cheap method of treating 
manure piles. Experiment 6, with chlorid of lime, was also successful, 
_but the price of this substance renders it less available for practical use. 
Most of our chlorid of lime is imported, and the writer is informed by 
wholesale druggists that the price in this country averages about $10 
a barrel. Although it is very generally used here for disinfecting. 
purposes, it is much more extensively used in Europe, where it is much 
cheaper. In Bulletin No. 4, new series, on household insects, the writer 
suggested keeping manure in an especially prepared receptacle. He 
is informed by Mr. Busck that at his home in Denmark, where the 
house fly had become very abundant and disagreeable on account of a 
stable nearby, a roofed brick building was built just behind the stable. 
This had two large swing doors on one side and a smaller door into the 
stable, through which the manure was always promptly thrown. Each 
day, after the manure was thrown into this receptacle, a shovelful of 
chlorid of lime was thrown after it. The manure was eventually 
hauled away through the double doors. No examination was made to 
see whether the chlorid of lime actually killed the flies, but it was 
supposed that it did so; and, at all events, this method of disposing of 
