Tinea Favosa. Favus. Honeycomb Ringworm. 25 



Care has to be exercised in the use of the mercurial prepara- 

 tions especially in the ox where absorption and licking of the 

 agent are to be dreaded. 



TINEA FAVOSA. FAVUS. HONEYCOMB RINGWORM. 



Cap-shaped crusts. Achorion-Schonleini : Spores, round, oval, may be 

 in chain form ; filaments, simple or branching, waving, little protoplasm, 

 abundance of spores (in receptacles), much homogeneous viscid matter full 

 of moving granules and rods. Accessory Causes : As in tinea tonsurans, 

 debility. Affects rodents, cat, dog, man (possibly horse, cow and sheep). 

 Cupped by growing around opening of follicle. Symptoms : Cat : On 

 paws, lips, face, navel ; sulphur yellow, cupped crust up to 4 mm., conflu- 

 ent ; base of crust swollen, red, moist ; mousy odor. -Dog : Paws, lips, 

 face, navel ; crusts gray (yellow beneath), base inflamed. Horse : Rabbit : 

 Paws, head, body ; crusts up to one-half inch, spores very abundant. 

 Young only suffered. Prognosis good, especially in spring, except in weak 

 and debilitated. Treatm.ent : Does best on delicate skin ; remove scurf, de- 

 pilate, apply sublimate, iodine, oxide of mercury, chrysarobin, sulphites, 

 copper sulphate, salicylic acid, camphorated phenol, creosote, naphthalin, 

 lysol, etc. 



This is a contagious skin affection manifested by the formation 

 of more or less circular and cup-.shaped crusts, and caused by a 

 vegetable parasite — Achorion Sch'dnleini. 



Essential Cause. Achorion Schonleini. This is shown 

 in the crumbling, cup-shaped crust in the form of spores and 

 mycelia after the manner of those of the trichophyton tonsurans, 

 but with character so distinct that they are easily differentiated. 

 The spores or conidia are round, or usually oval, and about 2/* 

 in diameter (in man 3 to 7/x), according to Zurn they reach 8/x in 

 birds and 12/* in the dog. They are often connected in short 

 chains of three or four. 



The mycelial filaments are usually i/a to 3/A in diameter (in 

 man j,}i. to 4/*). Megnin has found them 4/i to 7/x in rabbits, and 

 Zurn 4jM, to 8/x in dogs). They may be flexuous, simple or 

 branching and appear empty, the protoplasm being in smaller 

 amount than in the trichophyton. The spore tubes (sporophores, 

 receptacles), differ in being more straight, larger, and in contain- 

 ing chains of true spores. The differences from the trichophyton 

 tonsurans consist largely in the prevalence of oval spores, the 



