218 



DISEASES OF SHEEP. 



symptoms of itching or irritation appear. The sheep-grower should pay strict atten 

 tion to the health of his animals, and such care and attention will be abunddntl)r 

 repaid. 



Below we give the figures of the acari, that produce the scab as delineated by M 

 Waltz:— 



(Fig. 28), the female of 360 times the natural size, larger than the male, of an oval 

 form, and provided with eight feel, four before and four behind ; a the sucker ; bbbb 

 the four anterior feet, with their trumpet-iike appendices; cc the two interior hind 

 feet; dd the two outward feet, the extremities of which are provided with some long 

 hairs, and on other parts of the legs are shorter hairs. To these hairs the young 

 ones adhere when they first escape from the pustule— c, the tail, containing the anua 

 and vulva, garnished by some small hairs. (Fig. 29). The male on its back, and 

 seen by the same magnifying power; a the sucker; bbbb the fore-legs, with their 

 trumpet like appendices, as seen in the female cc, the two hind legs, with the same 

 appendices and hairs; rflhe rudiments of the abdominal feet; e the tail. — S.] 



SECTION xm. 



LICE, TICKS, AND FLIES. 



Sheep, and especially if they are neg-lected and poor, are often 

 sadly annoyed by these vermin. They frequently precede the scab: 

 the dreadful itching which they occasionally cause, prepares for or 

 produces the scab, or they multiply most rapidly when the skin ia 

 fouled by the scab. The sheep-louse is too well known to every 

 shepherd : it is of a brownish or reddish colour, with a flat body, and 

 tnree legs on either side; the tick has a large round body, and small 



