74 Observations on the ITahifs of Certain Flies 



high by packing and possibly, to a much less extent, to the mean of C 

 having been reduced by the effect of creosote oil mixture on fermentation 

 (Chart III). 



4. The flies began to emerge about the 12th day, the majority ap- 

 peared in 5 days; the period of emergence lasted about a fortnight. 

 2083 of the flies, which emerged in all three experiments, were caught in 

 the trap and counted; 99-5 per cent, of these were Musca domestica 

 (1141 in A, 680 in B, and 262 in C). 



5. Male M. domestica, as a whole, started emerging rather sooner 

 than the females. 



6. Creosote oil mixture when sprayed incrementally at the rate of a 

 gallon to the ton of horse manure did not entirely inhibit developement 

 of flies. But as these experiments were not carried out simultaneously, 

 it was not possible to judge of its precise effect from this experiment 

 (see pp. 78-80). 



7. Horse manure, which has almost finished fermenting and is cold, 

 has probably no attraction for adult house-flies, and very little nourish- 

 ment for their larvae, though larvae of other species have been found 

 therein throughout the winter and flies, in some cases, successfully reared. 



(For Temperature Curves see Charts I, II, III.) 



A FURTHER Experiment to Discover the Amount of Creosote Oil 

 Mixture necessary to spray upon Manure to Prevent 

 Developement of Flies, and the best method of Application. 



On February 26th, 1916, one day's production of horse manure, 

 procured from the same source as for the previous experiment, was 

 divided into five lots of 1 cwt. each. Each lot was then spread out 

 separately in a stable yard in layers about a foot deep, to allow of a 

 possible re-infection by flies. After 4 days exposure each plot was wetted 

 with half a bucket of water to make it about as damp as when first spread, 

 packed into tubs (Fig. 5) and treated as below: 



No. of 'I'll!) 'I'rcatnu'iit 



1 (control) I'ackcd down tii^litly 



2 Packed down timidly and sprayed on siiifacc w itli fino spray witli 2IS c.c. 



Creosote Oil Mixture -l jrallon to I ton 



3 Packed down titilitly and sprayed on surface willi line spiay uilli S7."5 c.c. 



Creosote Oil Mixturi' 4 jiallons to 1 ton 



4 I'ackcd down tightly and sprayed "incrciucntally '" witii line spray witli 



218 c.c. Crco.sote Oil Mixture I fiallon to I ton 



5 Packetl down ti^'htly and sprayed '■incrementally" \\illi line spray with 



873 c.c. ('reo.sote Oil Mixture 4 .irallons to I ton 



