8 
BULLETIN 1228, U. S. DEPARTMENT OF AGRICULTURE. 
Paradichlorobenzene dissolved in kerosene and gasoline, and 
naphthalene dissolved in kerosene, gave no better results than the 
respective oils by themselves. Naphthalene dissolved in gasoline 
was more efficient than gasoline itself. The use of paradichloro- 
benzene is not advisable, as it was found to impart a taste to eggs 
laid after the treatment of the chicken house. 
Mechanically mixed in whitewash and applied immediately, wood 
creosote oil was efficient when the oil comprised 11 per cent of the 
spray. Crude carbolic acid in whitewash was efficient at 10 per cent 
and inefficient at 8 per cent. Phenol was moderately efficient in 
whitewash at 11 per cent. 
The other tests reported in Table 2 were with mixed oils. They 
demonstrated the efficiency of heavy tar oils. The coal-tar oil 
(carbolineum) used in tests 13 to 18, inclusive, had a specific gravity 
of almost 1.2. Such an oil evaporates much more slowly than a 
mineral oil of the type of kerosene. 
Oils were used in the form of emulsions also. These are divisible 
into three types — emulsions of light mineral oil, heavy mineral oil, 
and coal-tar oils. In some of the second class a small quantity of 
coal-tar oil had been added. 
Table 3 presents the tests made with oil emulsions against the 
chicken mite. 
Table 3. — Results of tests with oil emulsions against the chicken mite. 
Nature of oil. 
Composition of emulsion. 
Dilution- 
Test 
No. 
Oil. 
Soap. 
Phe- 
nols. 
Water. 
Un- 
deter- 
mined, 
by dif- 
ference. 
Result. 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
Light mineral 
do 
Heavy mineral... 
do 
do 
do 
do 
do 
do 
do 
do 
Per ct. 
77.0 
77.0 
82.2 
82.2 
82.2 
84.1 
84.1 
79.6 
82.7 
82.6 
82.6 
30.4 
41.0 
41.0 
48.0 
50.0 
63.9 
63.9 
2 3.2 
Per ct. 
4.0 
4.0 
8.0 
8.0 
8.0 
7.5 
7.5 
5.9 
5.0 
4.2 
4.2 
24.6 
22.0 
22.0 
25.6 
22.0 
21.9 
21.9 
1.0 
Per ct. 
5.9 
""40.'6* 
30.0 
30.0 
12.0 
16.0 
7.5 
7.5 
( 2 ) 
Perct. 
18.6 
18.6 
6.9 
6.9 
6.9 
7.3 
7.3 
7.6 
6.4 
13.2 
13.2 
5.0 
5.0 
5.0 
14.4 
8.0 
6.7 
6.7 
Per ct. 
0.4 
.4 
2.9 
2.9 
2.9 
1.1 
1.1 
""2." 6' 
2.0 
""4*6" 
"*8 95.*8* 
lto3 
lto7 
lto2.5 
lto4 
lto6 
ltol6 
lto24 
lto4 
lto9 
lto3 
lto4 
1 to 157 
lto32 
lto99 
lto49 
lto24 
1 to 12.3 
1 to 19 
2 pounds to 
1 gallon. 
Efficient. 
Inefficient. 
Efficient. 
Moderately efficient. 
Inefficient. 
Do. 
Do. 
Somewhat efficient. 
Inefficient. 
Efficient. 
Do. 
13 
14 
i 15 
i 16 
17 
18 
19 
do 
do 
do 
do 
do 
do 
do 
Somewhat efficient. 
Inefficient. 
Moderately efficient. 
Efficient. 
Moderately efficient. 
Do. 
Inefficient. 
1 Box tests. 
2 Coal-tar oils and phenols 3.2 per cent. 
1 Sand and mineral pigment 95.8 per cent. 
The oil used in tests 1 and 2 was kerosene. The emulsion was effi- 
cient when diluted 1 to 3 parts water. 
In tests 3 to 11 the material contained a heavy mineral oil with 
high boiling point, and in addition a small amount of coal-tar oil was 
present in that used in tests to 9, inclusive. 
These oils were efficient when used at dilutions of 1 to 2.5 and 1 to 
3 parts water. 
