474 



MTSS W. H. SATJXDKRS OX THE 



temjoerature, etc. seemed .suitable for breeding, and untreated 

 manure in the same condition became infected, 



^ VI. Five heaps of long manure on a base 7 feet square, 

 rising 3 feet to a 3-foot square, were treated with : — 



Mineral oil and Pyridene 1 gallon with 40 gallons of soil. 



„ i „ „ 20 „ „ 



Tar oil and Pyridene 1 „ „ 40 „ „ 



i „ „ 20 



Control. — Soil only. 



Results. 



In two days maggots were found dead on the surface of the 

 Tar-oil-treated heaps, and a live one was wriggling in the full 

 light on the top. In four days the heaps contained large dead 

 maggots, and the Control contained full-grown maggots and 

 pnparia. Flies had evidently been laying in the Control. The 

 treated heaps were still free in ten days. 



VII. Three manure-heaps on a base 7 feet square, rising 

 3 feet to a 3-foot square. The manure was long but not infected. 

 They were treated with : — 



Mineral oil and Pyridene 10 o/q. J * S'"" ^P'-'n'^leJ over the base. 



<- h gall, with 20 galls, soil on surface. 

 Tar oil and Pyridene 10 o'n. Ditto. 



Results. 



In five days the Control and Mineral-oil heaps contained 

 maggots, but none were present in the Tar-oil one. It was 

 warm, moist, and appeared very suitable. Observation showed 

 that flies came readily to the heaps and that Pyridene appears 

 to be attractive, bitt the attraction is temporary. 



VIII. One large heap of mixed manure on a base 9 yards by 

 7 yards was treated with a watering of pure non-miscible liquids. 

 Seven gallons were used for a light watering. This was at the 

 same rate as that used in soil-treatment, showing that an appli- 

 cation of 1 -inch -thick treated soil at one part in forty is about 

 equivalent to a light watering with the liquid. 



N.B. — There was a Control heap to each set of experiments which was 

 examined for eggs and maggots, and where the conditions proved 

 unsuitable for breeding no conclusions were drawn from the Control 

 heaps. 



B. Plant Trials. 



All the substances used in the manurial experiments were 

 tested on plants in open plots, in pots, and in frames. 



I. Plots. 



1. At Wisley, Blast-furnace Creosote, Neutral Blast-furnace 



