216 
DISEASES OF DOMESTICATED BIRDS 
escape being hit by the fluid, it is necessary to repeat the applica- 
tion in a week and perhaps a third time may be necessary. 
Bishopp and Wood recommend crude petroleum as the most ef- 
fective agent and one that retains its killing power for weeks. 
Fie. 47. Female chicken mite before 
feeding, greatly enlarged. Mouth 
parts at right highly magnified. 
(Bishopp and Wood) 
To 
improve its spraying quality it 
may be thinned with one part of 
kerosene to four parts of crude 
oil. They likewise find arseni- 
cal dip such as used for dipping 
cattle to be fairly satisfactory in 
killing mites when applied sev- 
eral times. 
Repp recommends preparing 
kerosene emulsion as follows: 
One-half pound of laundry soap 
or whale-oil soap is shaved fine . 
and dissolved in 1 gallon of 
water. The soap is best dis- 
solved if the water is nearly 
or quite at the boiling point. 
When the soap is dissolved and 
the water is hot it is removed from the fire, 2 gallons of kerosene 
oil is added, and the mixture is agi- 
tated or churned violently until 
emulsion is formed. The best way 
to produce the emulsion is to pump 
the liquid back into the same con- 
tainer through the pump until the 
mixture becomes creamy. To 
make a ten per cent emulsion, 17 
gallons of water are added tothe 3 
gallons of stock mixture; to make a 
fifteen per cent emulsion, 10% gal- 
lons of water are added to the 3 
gallons of stock mixture. 
Subsequent to spraying with 
kerosene emulsion it is desirable to 
dust the entire interior of the 
houses with a mixture of air slaked 
lime, 3 parts and sulphur, 1 part. 
Fie. 48, 
feeding. Greatly enlarged. 
opp and Wood) 
Female chicken tick after 
(Bish- 
A further measure against mites consists in painting the perches 
