■ib'I Till' Manure Heap (iiul the J louse I'll/ 



Exiieriiiient X. Hcaj) 1 was re-oppnerl and the contained liorse 

 manure exposed for about a week. After closing in again no flies of 

 any kind emerged. 



Experimertt XI. Hea]) '2 containing mixed manure was re-exposed 

 and afterwards trapped. No flies were obtained. 



Experiment XII. Heap containing mixed manure was submitted 

 to a second infection period but produced no flies. 



Erferiment XIII. Heap 3 was refilled with horse nianure obtained 

 from a large stud stable in the neighbourhood. This estabUshment is 

 right away from dwellings, and precautions are regularly taken to 

 disinfect the manure. That supplied for the experiment had not been 

 treated in any way. The heap was made up on August 24th. On the 

 25th numbers of small maggots were observed on the surface, and 

 these were evidently suffering from the heat. The temperature on the 

 surface exactly where the maggots were wriggling was found to be 42°. 

 Two inches below the surface it was i)7°, whilst the centre of the heap 

 gave 65°. A few M. doiiteslicu were observed inspecting the heap. 

 Towards evening numbers of the maggots were found to have been killed 

 by the heat. On August 30th the heap was completely enclosed. 

 By September 3rd one M. domestica and several small Anlhomyidde had 

 appeared in the top trap. 



The traps of this heap were cleared on September litli, when four 

 M. domestica were taken. The experiment continued till September 10th, 

 the total flies taken being: 



M. domestica L. ... ... ... 12 



Limnophora seftemnotaUi Ztt. ... 37 



Exferiment XIV. Heap 1 at farm having been cleared out, fresh 

 horse manure from the adjoining stable was placed in it in such ijuantities 

 as were available from day to day. The heap was finally closed up on 

 August 18th. having been open to infection for some 12 days. By 

 August 24th no flies of any kind had emerged. By September 7th no 

 M. domesiica had been produced, but 18 Fannia r.anicularis were taken 

 from the top trap and five from the sides. The experiment was continued 

 till September lotli. by which date the following flies had been taken: 



>Slo>iio.ri/s cdlvitnins L. ... ... 3 



Fannia caniculari.'i L. ... ... 14 



Phaonia (juerceli Bouche ... 2 



ChortofhiJa cilicnira Rdi. ... 17 



Calllphont eri/llirncephula Mg. ... 1 



