FAVTTS. 91 



Favus of Folds. 



The Favus, or ' Tinea favosa,' of Fowls differs but 

 slightly from that of other animals, and is clearly due 

 to the above-named fungus, as can be plainly demon- 

 strated by microscopical examination. 



In fowls the Favus first manifests itself on the 

 comb, wattles, and neck. Often I have noticed one 

 side of the head being affected only. The first signs 

 of the attack are small pale yellowish spots, cup-like, 

 but sometimes irregular in form. These gradually 

 grow and unite, eventually forming a confluent 

 covering of a greyish-yellow substance, showing 

 concentric markings. By degrees, usually in about 

 four to five weeks, the feathers of the head, and 

 possibly neck, become affected. The feathers are 

 stiff, brittle, and eventually fall off, leaving sometimes 

 their base still implanted in the scutula of the ' Favus.' 

 The discoid masses of Favus have slight depressions 

 in their centre from which the feathers have fallen. 

 The depositions apparently form around the bases of 

 the feathers. Birds so affected are said to give off a 

 rather offensive mouldy odour ; this, personally, I 

 have failed to detect. 



Efect of the Disease. 

 The general result of Favus is debility and wasting, 

 if no steps are taken to destroy it. Very often death 

 of the patient results. I have nevertheless known 

 cases of spontaneous recovery without any remedies 

 being applied. 



