162 



SHEEP DISEASES. 



In making up dips one should take into con- 

 sideration the severity of the infection; the state 

 of weather; the kind of sheep; the hardness of 

 crusts, and the facilities for dipping and heat- 

 ing the water. This requires judgment and ex- 

 perience. 



The sediment from the dipping vats is usually 

 diluted and thrown around 

 the corrals or pens as a 

 disinfectant. 



Many other dips are 

 used with good success. 

 Coal tars, arsenicals, car- 

 bolic acid, potassium sul- 

 phid and patent dips are 

 all on the market. Since 

 the war, the prices of 

 certain chemicals 

 have so risen that the 

 old lime-and-sulphur has 

 gained somewhat in 

 popularity. 



To eradicate scab from a band of sheep, every 

 member of the flock should be dipped two or 

 three times; kept under close supervision, and 

 at the least symptoms of its recurrence, re- 

 dipped. 



The vitality of the mite egg or the mite itself 

 is exceedingly great, although the exact length 

 of life is unknown. However, it is not considered 

 good policy to drive sheep into a corral or pen 

 that has been infested within a year. 



SHEEP TICK (Melophagus 

 ovinus). Male. Dorsal 

 view, enlarged. 



(From Curtice, 1690.) 



