RESULTS OF EXPERIMEITTS AGAINST THE CHICKEN MITE. 6 
those tests was 360 cubic feet, and they were as air-tight as the 
average chicken house. All the last four treatments were of little or 
no value. 
BANDING ROOSTS. 
A heavy anthracene oil applied on burlap strips at the ends of 
clean roosts failed to prevent the access of mites from other places in 
the chicken house. A few days after the application the oil hardened 
and the mites were able to cross it. Similar bands made of sticky 
tree-banding material were also inefficient; even when protection was 
given from the fowls by placing boards above the sticky portion of 
the roosts. 
MEDICATED ROOSTS. 
A wooden roost grooved beneath so as to fit tightly to a tin trough 
running the whole length of the roost and containing a coal-tar and 
mineral-oil mixture, when placed in an infested chicken house, 
repelled the mites as long as the trough contained oil to keep the 
wooden roosts permeated. This roost had no effect on the mites in 
other parts of the house (e. g., the nest boxes). 
SUBSTANCES IN FOOD AND WATER OF FOWLS. 
The preparations following were all without value when added to 
the food and water of fowls: Two lime-sulphur preparations, each 
containing less than 12 per cent of calcium polysulphids and calcium 
thiosulphates diluted at the rate of 1 to 2,150 and added to food and 
water for 5 and 13 days, respectively; three preparations containing 
from 33 to 35 per cent of free sulphur, added to each quart of food at 
the rate of 1 heaping teaspoonful three times a week for 6 weeks; 
and one preparation containing 38 per cent of free sulphur with a 
trace of naphthalene, used as in the preceding test but for 4 weeks 
only. 
REPELLENT SUBSTANCES SUSPENDED IN INFESTED PREMISES. 
A preparation consisting of naphthalene 14 per cent, carbon disul- 
phid 46 per cent, and mineral oil 40 per cent, contained in a bottle 
with a wick, suspended from the roof of a chicken house for 2 
weeks, was without value. Fifteen grams of pyrethrum (ground 
flowers) was suspended in a cloth bag from the top of an infested nest 
box. This also was of no value. 
NEST EGGS, NESTING HAIRS, AND NESTING MATERIALS. 
Prepared nest eggs, which are primarily designed to protect sitting 
hens and remain in use during the period of incubation, were used 
in infested nest boxes only, to determine whether they would be 
efficient in killing or expelling the mites. 
Eight tests were made with eggs of pure naphthalene. In no case 
was any efficiency shown. These eggs remained in the nests for 
periods as long as 25 days. Their use in some instances caused 
marked injury to the fowls sitting on them and appeared to interfere 1 
with the health of the embryo chicks alongside them. 
Five tests were made with eggs of naphthalene and paraffin mixed. 
These eggs were used in five infested nests for 2 hours on each of 
3 days, at intervals varying from 6 to 8 days. None of these treat- 
ments was of value. 
