SHEEP SCAB. 
21 
ARSENITE OF SODA. 
Table Showing Results of Laboratory ExjDeriments. 
Date of Treatment 
Condition 
After i6 Hours 
Condition 
After 44 Hours 
Strength Used 
Dead 
Alive 
Dead 
Alive 
November 
5 
12 
o 


Full Strength 
November 
6 
lO 
4 
7 
7 
Full strength 
November 
II 
lO 
0 
— 
— 
% Full Strength 
November 
II. 
12 
0 
— 
— 
Yi Full Strength 
November 
12 
3 
3 
4 
2 
Yi Full Strength 
November 
13 
i6 
9 
— 
Fev7 
Yi Full Strength 
December 
6 
10 
6 
lO 
6 
^ Full Strength 
December 
6 
6 
10 
4 
12 
Yz Full Strength 
Full strength, as given in the above table, would be one ounce of 
arsenic and the same of carbonate of soda to one gallon of water. The 
experiments would indicate that, if used much weaker than this, it would 
not be very effectual. I believe this dip too poisonous to be used with 
safety. 
AUSTRALIAN DIP. 
Laboratory experiments with this dip were not satisfactoiT, as the 
solution on drying became a hard lump that inclosed the mites. On crush- 
ing this it became a mass of diy powder. Most of the mites that could 
be found after sixteen hours were dead, but in nearly every case a few 
living were found also. 
There is no doubt but what tliis would be a very effectual lime and 
sulphur dip, but 1 believe it too strong to use on the sheep, and stronger 
than is necessary to kill scab. 
COPFEBAS DIP (GREEN VITRIOL). 
Tw'O tests were made in the laboratory of copperas as a dip. In 
one, the proportions wei-e three pounds of the crystals to ten gallons of 
water, and in the other three pounds of the ciystals to twenty gallons 
of water. In the former strength, about one-third of the mites were 
quiet at the end of sixteen hours, and in the latter strength only one 
mite in eight seemed dead at the end of the same time. At the end of 
forty-four hours one-half of those treated with the w^eaker solution were 
still active. 
FLOUR OF SULPHUR (DRY). 
Dry sulphur w'as thoroughly dusted into a lock of wool containing 
scab mites. At the end of sixteen hours four dead and five living mites 
w’ere found, the latter having all left the wmol. At the end of forty hours 
two mites were still crawiing about covered with sulphur. 
FLOUR OP SULPHUR IN WATPIR, 
Used in the proportion of one pound to eight gallons, and one pound 
to twelve gallons of water. In tlie former case there were four dead and 
five active ones at the end of sixteen hours. At the end of forty hours 
one mite covered with sulphur was still active. In the weaker strength 
all the mites were active at the end of twelve hoars. 
