:5i) 



some thai ihc discnsi' is in facl pi educed by a v<'jj;(*- 

 table par.asito. biil as yet 

 this has not been proven. 

 The other v;iriety of 

 body nranuc is caused by 

 a parasite i;n;)\\ii as 

 Sarcoptes hvvis. Of 



hite years it lias bei-n 

 coininon in Kurope. aiid 

 has jt.revr.iled espceiallv 

 dnrinfj thc^ sprinji- and 

 summer. It may be<;in 

 on any part of the body 

 and usually spreads un 

 tit the entire skin is af- 

 fected. When it has 

 reached this stase the 



The PAKAsiTi; of One Form of Boot 



whole body is bare and -mange of fowi-s. 



the only feathers that re- ;;;^ actual size. 



main are a few in the tail and some in the w inj^s. 

 The skin is healthy in appearance, with the exception 

 that it is devoid of covering. It is smooth, flexible 

 and noiiual in color. There is no itcliino: and the gen- 

 eral health of the f oa\ 1 is usually good, although some- 

 times, after having l)een afflicted for a long time it nuiy 

 become thin and gradually waste away. When feath- 

 ers are pulled out ou the border of the diseased area 

 it is noticed that the lower end of the sheath is covered 

 with scaly^ layers and the i)arasite can usually be dis- 

 covered among them. 



SchaelTer has recently reported a case where this 

 disease ajjpeared among a Hock of 70 hens and nearly 

 all of them lost all of their feathers, with the exception 

 of those in tlu^ wings and tail. The parasite could 



