22 
SHEEP SCAB. 
CURTICE DIP. 
Only one laboratoiy test was made with this dip. After sixteen 
hours there were many active and few, if any. dead mites. At the end of 
five days two active mites were found. 
A very similar dip, prepared in the proportions of four pounds of 
strong tobacco and one pound of sulphur to ten gallons of water, was also 
used. At the end of sixteen hours the mites seemed uninjured. Only 
one test. 
MILK OF LIME. 
Wool treated with this dip became a hard lump on drying. After 
crushing the lump, at the end of sixteen hours, three living mites were 
found. Probably there were dead ones present, but, being quiet, were 
not seen. It would seem that lime has but little effect on the mites. 
TOBACCO DECOCTION. 
The first lot dipped was kept under for only one minute, and then 
the wool was dried by laying it on blotting paper. Nearly all the mites 
were lively at the end of four days. The decoction was also used in 
one-half, one-fourth and one-eighth the above strength in the same manner, 
and with the same result in each case. 
Very strong tobacco leaves, from tobacco raised by the horticul- 
tural department, were also used in the same proportion (two pounds 
to a gallon of water), but the dipping was for two minutes, and the dry- 
ing of the wool was in the usual manner. At the end of forty-four hours 
twelve dead and eight active mites were found. 
These experiments seemed so unfavorable for tobacco that I con- 
cluded not to experiment with it farther. It is very possible that tobacco 
has a cumulative effect not shown in these experiments. 
CARBOLIC ACID AND CORROSIVE SUBLIMATE. 
Only one lot treated. At the end of twenty-four hours there were 
twelve active mites and few, if any, that were dead. 
KEROSENE EMULSION. 
Having found kerosene emulsion veiy effectual in destroying lice 
that infest cattle and hogs, I expected it would be an effectual remedy 
for scab in sheep. My laboratoiy experiments were so disappointing that 
I did not test the emulsion farther. It might have proven more effectual 
on sheep. 
The mites were first dipped for one-half minute in full and one-half 
strengths. At the end of sixteen hours the mites were all lively, though 
wet with kerosene. The experiment was repeated in both of the above 
strengths, and at the end of forty-four hours all the mites Avere lively. 
KEROSENE. 
Failing v/ith kerosene emulsion. I made one test with pure kerosene 
to see if it would kill. A lock of wool containing mites was dipped for 
one minute. At the end of two hours all the mites were active. At the 
end of sixteen hours four semed dead and five were still active. All were 
wet with the oil. At the end of forty-eight hours all Avere dead. Kero- 
sene, either pure or in the form of an emulsion, may be a sure destroyer 
of the mites, but it is certainly not rapid in its action. 
ALCOHOL. 
Finding that kerosene had so little effect, I thought I Avould see 
what 95 per cent, alcohol would do. A quantity of mites was dipped for 
one minute in this substance. At the end of sixteen hours all Avere still 
active, and at the end of forty-eight hours only a feAv had died. 
