1904.] 



Experiments in Dipping Sheep. 



363 



As regards sheep-scab, the experiments have shown con- 

 :lusively that one dipping in a good dip is sufficient to effect a 

 :ure. 



In the second series of experiments no traces of living acari 

 vere found after the first dipping, when effective dips were used, 

 [n the third series the sheep were only dipped once, and although 

 :hey were allowed to run with other sheep, and were examined 

 it intervals for ten weeks, no trace of scab was found. 



Where a flock is attacked with scab, it is suggested that bad 

 :ases should be carefully examined, and that the dip should be 

 veil rubbed into all affected parts. This should not be done 

 vhere arsenical preparations are used. 



With regard to the dips employed in the experiments, 

 Professor Winter considers Dip No. XVI. very satisfactory. It 

 proved effective both in destroying keds and in curing scab. It 

 s a fluid dip, mixes readily with cold water, leaves the wool in 

 1 beautiful condition, and has no injurious effect upon the sheep, 

 ts present price is, however, almost prohibitive. The other 

 obacco preparations, although effective dips, appear to be 

 ather more crude. 



Tar acid (carbolic) dips are very effective in destroying both 

 Lcari and keds, and, when skilfully prepared, leave the skin 

 md wool in a nice condition. Unless the strength is carefully 

 egulated they cause irritation to the sheep for some time 

 iter dipping. They have a marked effect in healing sores. 

 )f those used, Nos. X. and XIII. were the best. Both are fluids 

 .nd mix readily with cold water. No. X. discoloured the wool 

 omewhat, and, when used in the summer, No. XIII. caused a 

 ertain amount of irritation to the sheep for some time after 

 lipping Apart from this, it is considered a very efficient dip. 

 )ip No. VI II., of the strength used in the second series, 

 >roved to be fairly satisfactory. The other carbolic dips, 

 Jos. XL, XII., and XVII. (used only in the second series)* 

 -ere crude preparations, inflicted pain on the sheep, and' 

 lthough they were effective in destroying keds and (in the 

 ase of No. XVII., the only one tried) in curing scab* 

 liould not be employed. 



The arsenic and sulphur dips are thoroughly effective in 

 uring scab and destroying keds, but the experiments have 



