SHEEP SCAB. 
29 
temperature that will keep them active, provided the temperature 
is not low enough to kill them and that they are not supplied 
with food. 
Fifth — That they will live longer in a moderately low tem- 
perature if the temperature is kept steadily below that point 
which will make them active. In other words, a steady low 
temperature is not as destructive to them as alternating low and 
high temperatures. 
The longest that mites were kept alive with above experi- 
ments was twenty days. 
The results with the preceding experiments, both with eggs 
and mites exposed to out-door temperatures, make it almost cer- 
tain that the infection can not be carried over winter off the sheep, 
and it also makes it highly improbable that the mites or their 
eggs will live for more than a very few weeks at any time of the 
year unless upon sheep or some other animal that can serve 
as food. 
DOBS DIPPING GIVE THE SHEEP A “SET-BACK?” 
Sheep feeders are quite unanimous in the opinion that dip- 
ping gives the sheep a set-back. Some think it will take one, 
others that it will take two or three weeks of feeding to get the 
sheep back to the weight at the time of dipping. The following 
weights were made for the purpose of determining the loss oc- 
casioned by dipping in these experiments : 
Table Showing Loss of Weight Caused by Dipping. 
fDates of Weighing 
Lot 
Nov. 
Nov. 
Nov. 
Nov. 
Nov. 
Dec. 
Dec. 
Dec. 
Dec. 
Dips Used 
17 
20 
23 
1 
27 
3 
5 
8 
22 
I 
51 
52 
50 
50 
50 
51 
52 
53 
50 
51 
55 
55 
53 
55 
56 
59 
58 
Zenoleum, Nov. i8th. 
Zenoleum, Nov. i8th and Dec. 
2 
55 
56 
ISt. 
Zenoleum, Nov. i8th and Dec. 
52 
48 
58 
3 
49 
50 
53 
50 
52 
ist. 
4 
53 
51 
51 
53 
51 
54 
56 
57 
59 
Potassium Sulphide, Nov. i8th 
and Dec. ist. 
43 
47 
48 
46 
51 
54 
Ft. Collins Lime and Su. Dip, 
5 
44 
51 
53 
Nov. i8th and Dec. ist. 
6 
43 
43 
47 
47 
47 
48 
49 
50 
53 
Chloro-Naptholeum, Nov. i8th 
only. 
7 
42 
43 
46 
45 
43 
46 
47 
48 
50 
Cooper Dip, Nov. i8th and 
Dec. ist. 
8 
44 
45 
47 
46 
44 
48 
50 
50 
52 
Black Leaf, Nov. i8th and Dec. 
ist. 
9 
44 
45 
48 
47 
44 
47 
49 
49 
52 
Black Leaf, Nov i8th and Dec. 
ist. 
10 
43 
44 
47 
46 
44 
46 
49 
49 
51 
Black Leaf, Nov. i8th and Dec. 
ist. 
II 
47 
47 
49 
49 
47 
51 
51 
52 
53 
Not dipped. 
fThese weights were made by F. L,. Watrous, of the Agricultural Department. 
