ON WARBLES AND THE MANGE. 437 



bles which are the confequence of external 

 prefTure ^of the faddle, and thofe which arife 

 from an internal caufe ; namely, the heat and 

 richnefs of the blood. Thefe appear on the 

 back and buttocks, denoting the want of coolers 

 and attenuants. Salts; if the eyes are inflamed, 

 bleed. Humour-blindnefs is preceded by a 

 fucceflion of Warbles, as I have often remark- 

 ed ; they have alfo been formerly flyled a fly- 

 ing farcy. 



THE MANGE, 



In animals, like the Pfory, or Itch in the hu- 

 man fpecies, is " a contagious prurient erup- 

 *' tion," arifing from a thin, ferous and acrimo- 

 nious ftate of the blood, and an obftru6lic?h in 

 the pores or excretory du61s of the miliary 

 glands, where the perfpirable matter being de- 

 tained, becomes ichorous and corrofive, and at 

 length, frets its' way through the flvin, making it 

 raw or wTinkled in different parts of the body. 

 Wood, who affirmed that the mange did not 

 proceed from vitiated blood, but from infe61s 

 hatched in the furrows of the cuticle, only mif- 

 took the effetl for the caufe, and had not con- 

 fidered that corrupted .humours were a proper 

 fource, or matrix for the generation of ova or 

 eggs. Like the Italian Dr. What-d'ye-call- 

 him, he naturally fuppofed the horfe might as 

 well be fly-blown \viihout-fide as within : nor 



can 



