HOUSE FLY IWESTIGATIONS. 



471 



Liquid poured down 

 a hole in the centre 

 in the strength of 

 25 ozs. diluted to 

 3g^ gallons with 

 water (=2 ozs. to 

 tlie quart per 10 

 cuhic feet) = 5 "'n. 



Maggots put in six 

 positions. 



Liquid sprayed as 

 stack was built in 

 the strength of 

 24 ozs. diluted to 

 4| gallons (= 1^ 



- ozs. to 1 quart per 

 10 cubic feet). 



Maggots put in four 

 positions. 



Results. 



Westoran. Miscihle Pyridene. 



In 24 hours : — ■ 

 All dead. All dead. 



In 2 days :— 

 Dead near the centre. Dead near the centre. 



Kerosene. 



3 lots dead. 



4th lot dead. 



Siglrer Pj/ridene 

 Bases. 



In 24 hours :— 

 3 lots dead. 



In 2 days : — ■ 

 4th lot dead. 



Cresol. 



2 lots dead. 



3rd lot dead. 



4. Two heaps, each on a 5-foot-square base, 5 feet high with 

 a 1^ -foot-square top, treated with : — 



Miscible Pyridene 5 "/„, 1 tpiart to 2 gallons of water. 

 ,, Heavy, 2 quarts to 2 gallons of water. 



Liquid was poured 

 down the centre 

 in the strength of 



1 quart diluted to 



2 gallons ^with 

 water. Maggots 

 were put in two 

 positions. 



The manure used 



Results. 



In a few days flies were emerging from both 

 heaps. The heaps were opened, and the oil 

 was found to be concentrated in the centre. 

 Both were hot, and puparia were present in 

 the bottom edges of the heap and in the soil 

 under the edges. 



for the above experiments was not fly- 



infected ; inaggots enclosed in gauze were put into the heaps. 



The Application of Fly -Deterrents. 



The following non-miscible liquids were used : — 



Neutral Blast-f uiiiace oil. 

 Blast-furnace Creosote. 

 Green oil. 



Tar oil and Pyridene. 

 Mineral oil and Pyridene. 



They were applied by ; — 



(a) Mixing with soil in the proportion of one part liquid to 

 forty parts soil. The soil was piled into a cone, and the oil 



