SHEEP SCAB. 
II 
siderable attention in the future, I have thought it best to record 
the results of all mj experiments with different materials for 
the destruction of either eggs or mites for the guidance of those 
who ma}^ take up the work hereafter. 
EXPERIMENTS WITH THE DIFFERENT DIPS. 
Fort Collins Lime and Sulphur Dip — This dip was used upon 
sheep only; the laboratory tests of lime and sulphur dips were 
made in other proportions. 
On November 18, thirty-five sheep were dipped, care being 
taken that all were put entirely under at least twice. 
Mild cases of scab were known to exist in this bunch, but, 
unfortunately, the men who did the work misunderstood my di- 
rections and put in no sheep having heavy scab, as I intended 
that they should. December 1 the sheep were dipped again in 
the same preparation, no sign of scab having developed in the 
meantime. At this date, April 15, no fresh scab has appeared. 
By purchasing the sulphur in a car-load lot, the feeders at 
this place were able to dip their sheep at less than one cent per 
head in November. 
Calif o?mia Dip — 
Laboratory Experiments— Applied October 27. Examined sixteen hours 
after, when several active, but no dead, mites could be found. 
Experiment repeated November 5. Examined sixteen hours after, 
when four active and seven dead mites were found. Examined forty hours 
after, when only one living mite could be found. 
Repeated again November 6. Sixteen hours after a single mite was 
found, w’hich was very active. After using this dip the wmol would dry 
into a hard lump, so that it was difficult to find the mites at all. The lump 
would crush rather easily into a mass of fine powder. 
Experiment repeated in one-half the above strength, November 5. 
Sixteen hours after there were ten dead and five active mites found. 
Forty hours after there were stiil five active mites, but only one seemed 
in good condition. 
Experiment on Eheep — One sheep with heavy live scab was 
treated with this dip November 14. 
When examined, November 16, the wool was matted and 
heavily loaded with a fine powder. The wool was harsh and dry, 
and could be easily picked from the sheep with the thumb and 
finger. The wool did not pull from the skin, but would break 
near the body, where the fibres were nearly eaten off by the lime. 
No living mites could be found. No living scab has developed to 
the present time, April 15. 
