ACHORION SCHOENLEINIL 177 



nnd form crusts, consisting of epidermis and pus, and cannot be 

 enucleated. (Lebert.) 



Special changes of the hair. The hair is restored from time 

 to time, but always in an altered condition, and has more of a 

 milk-hair-like appearance ; it splits also longitudinally into fibrillse, 

 which sometimes are entangled, sometimes ravelled out, and is 

 dotted all over with molecular granulations, epithelial cells, and 

 numerous spores. The hair is never entirely lost, except on the 

 oldest diseased parts. According to Bazin, the shaft is sometimes 

 the only diseased part, sometimes the favus-matter is found on 

 it here arid there, when the hair looks dead, lustreless, and the 

 external layer and medullary substance are usually mixed together, 

 and the longitudinal fibres are broader and thicker than in the 

 normal state. Other hairs exhibit a change of the inter-follicular 

 substance ; spores and mycelium-tubes are found on the mem- 

 branes, or sometimes favus-matter in large quantity between the 

 prolongation, in root- shaped prolongations, and the tunica internet 

 of the follicle of the hair, as a kind of conus, the point of which lies 

 between the radicles of the hair and the inner part of the capsule, 

 and the rugged basis corresponds to the upper end of the inner 

 tunic of the follicle, and has in front the epidermal channel of 

 the hair. Other hairs show also no follicle, or merely a few 

 broken pieces. The bulb of the hair, the root, and the root- 

 shaped prolongation of the hair are interspersed with spores and 

 tubular filaments. Sometimes globules of pigment are seen at 

 the nearer end of the longitudinal fibres, sometimes they are with- 

 out pigment. Spores and tubes of the favus are met with even 

 in the centre of the shaft. The highest degree of degeneration 

 of the hair is marked by atrophy and discoloration, when it ex- 

 hibits on the edges tubular filaments, proceeding from the centre 

 of the hair, similar to the changes which the latter undergoes in 

 Herpes tonsurans. 



Bazin recapitulates thus the changes of the hair : 

 The change of the hair does not proceed from the pressure of 

 the favus on the hair. 



1. The constituent parts of the bulb themselves are altered, 

 producing a disturbance of their inner texture, and not merely 

 atrophy. 



2. The follicles of the hair are likewise under the influence of 

 the disease. 



3. The favus and its intra-epidermidal part is most frequently 



12 



