64 
cany ilic lv<*instMi(* down into it. Si'pttMnbei- 7, on examination most of 
tlM*l;n\a' were IoimkI lo ixMlrad. About 20 i)er cent, liowevei', were still 
alive. Tiic niannit* was tlicn turne<l. On 8ei)tenibi'r S about as many 
were still living as on the previous day. 
I'jjK'r intent '» (kciosrne). — On September 7, S quarts of fresh horse 
nianun' containiu'^ house-fly larva* were ])la(ed as before in a tin pan, 
sprayed with 1 pint of kerosene, washed down afterwards with 1 
quart of water. The nianuie was then rather thorouj^hly mixed and a 
little Uiore water was poured on. The treatnuMit was thus identical 
with that in experiment 4 witli tlie exception that the manure was 
stirred after the kerosene spray ha<l been washed in. On 8ei)tend)er 8 
every larva in the nuiss was dead, 'i'he tirst examination showed not 
a sin«'ie survisor. 
Experiment a {chlorid of lime). — October 1."), mixed 1 ])ound of cblorid 
of lime with S (piarts well-infested horse manure. Kept in bucket. 
October 10. nearly 00 per cent of the larva* were dead, the remainder 
ha\iii.u burrowed into the large lumps of manure. October is, no 
livinji hnva* could be found. 
E.rjHriiiHut 7 {chlorid of litnc). — October 21, mixed one-fourth ])ound 
with S <juarts rather si)arsely infested fresh horse manure. Kept in 
bucket. October 22, careful examination showed only two <lead larva*. 
Many were seen which were apparently unatlected. October 2:5, no 
dead ones were found. October 25, no dead larva* fonn<l: all larva- 
had hardened into apparently healthy i)uparia. 
CONCLUSION AND GENERAL REMARKS. 
Experiment Xo. T) indicates an easy and cheai) method of treating 
manure piles. Experiment 0, 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, ami the writer is informed by 
wholesale druggists that the price in this country averages about 810 
a barrel. Although it is very generally used here for disinfecting 
purposes, it is much more extensively used in Euroi)e, where it is much 
cheaper. In J>ulletin No. 4, new series, on household insects, the writer 
suggested keeping manure in an especially juepared receiitacle. He 
is informed by Mr. llusck that at his home in Denmark, where the 
iiouse lly 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 i)romptly thrown, l^ach 
day, after the manure was thrown into this receptacle, a shovelful (d" 
chlorid of lime was thrown after it. The manure was eventually 
hauled away through the doubU^ doors. Xo examination was nuid(* to 
see whether the chlorid of lime actually killed the Mies, but it was 
supposed that it did so; and, at all events, this method of disposing of 
