23 The Sheep-Scab. 



decoction at a tepid temperature, renewing the 

 infusion from time to time. 



From a succession of yards, the sheep are 

 brought rapidly through the "race," too narrow- 

 to admit of their turning around for a retreat; 

 thence they plunge into the tank, steaming with 

 the preparation for the destruction of the para- 

 sites, and emerge therefrom upon the battens of 

 the draining yards, there to stand until the 

 drippings have run off, after which they pass 

 out. 



A man should be stationed on each side of 

 the vat, with a crutch to dip each sheep over 

 the head; one at the end of the double race, 

 also with a crutch, to compel every sheep that 

 hesitates, to jump into the dip; three men yard- 

 ing and one attending to the boilers and draining 

 yards. With such an apparatus and seven men, 

 there is a capacity for dipping ten thousand 

 sheep a day. 



Either of the above mentioned processes will 

 kill all the parasites that exist at the time of the 

 operation; but it will not destroy the eggs that 



