SKIN DISEAskS. 28;^ 



Sheep suffer much in some locahties from the larva of the 

 blow-fly, laid on any damp or dirty part of the skin, as on the 

 tails and thighs when scouring. In such neighbourhoods the 

 existence during summer or autumn of a dark wet spot on the 

 skin, of a white tuft of wool, or of wriggling of the tail, will de- 

 mand immediate attention. 



Treatment. — Clip off the wool and filth, pick off all maggots 

 and apply oil of turpentine or of tar 5 oz., camphor i dr., 

 asafoetida d dr. ; dilute carbolic acid or kerosene may be used 

 in the absence of anything else. To prevent the attacks use 

 the sheep dip advised for scab, or cut off the dirty wool and 

 apply carbolic acid i part, water 50 parts. 



SHEEP-TICK. HIPPOBOSCA (mELOPHAGUS) OVINA. 



This is a dipterous insect degraded by the non-development 

 of its wings. It is best met by the dips advised for scab. It is 



FiR. 55,— Sheep-Tick with egg. Magnified. 



especially important to dip lambs, after affected ewes have been 

 shorn, as the insects migrate to the young, where they find 

 more wool to shelter them. 



FLEAS. 



These, like the hippoboscid?e, are wingless diptera. We 

 have a variety each for the dog, cat, hen, and dove, and in 

 tropical America the ptilex penetrans or Chigoe which burrows 

 under the skin, and there lays its eggs to be hatched out in the 

 flesh. Persian insect powder is one of the best agents to dust 



