2 BULLETIN 245, U. 8S. DEPARTMENT OF AGRICULTURE. 
favorable place for the deposition of eggs. A treatment two or three 
times a week ought to suffice for all these cases except where large 
quantities of organic material are added, when the borax application 
should be made immediately, using the same quantity as in the treat- 
ment of horse manure. The best results are always obtained when 
the borax is applied in solution daily, as it is effective against the 
eggs and the maggots during their feeding period. (Table V, series 52, 
Gand H.) Borax probably has no effect on the pupe or adult flies. 
GENERAL PLAN OF EXPERIMENTAL WORK. 
CAGE EXPERIMENTS. 
The plan of the work was the same as that outlined in Bulletin-No. 
118, and in addition a few experiments were carried out in concrete 
pits. New cages were constructed for the experiments at Arlington. 
In order to prevent the escape of larve by migration, the galvanized- 
iron pans in the cages in which the manure was placed were made 
2 feet deep, and the small openings in the bottom of the pans through 
which the water drained off were covered with fine wire gauze. The 
legs were made 8 inches high to facilitate the removal of any larvee 
which might get into the drip pans. 
The manure was sprinkled in three layers by putting 2 bushels of 
manure in the cage and applying 24 gallons of the solution. This 
was repeated in the second layer of 2 bushels. Finally the remaining 
4 bushels were added and the last 5 gallons of the solution applied. 
When a chemical was applied in dry condition it was scattered over 
the surface of the manure, which was also treated in three layers, and. 
10 gallons of water were afterwards added. The manure in the con- 
trol cages was sprinkled with water equal to the volume of the solu- 
tions read: The flies which were caught in the traps attached to the 
top of the cages were chloroformed and counted, and at the end of 
each experiment a comparison of the total ee was made, and 
from these counts an index of the effectiveness of the ieee was 
obtained. Only fresh manure was used in the experiments, and every 
effort was made to provide for an even distribution of fly eggs and 
larve. That it was impossible to secure an equal anges: in all 
cages is evident from a comparison of the fly counts from the con- 
trol cages. 
OPEN-PILE EXPERIMENTS. 
A few open-pile experiments were carried out at Arlington on the 
same plan as during the previous year. The most important open- 
pile experiments were conducted at New Orleans during November 
and December, 1914. In most of the New Orleans open-pile experi- 
ments 4 bushels of manure were sprinkled with 5 gallons of solution 
daily, and this was repeated four times, making a total pile of 16 
bushels treated with 20 gallons of solution. The total number of 
