CHAPTER XLIV. 



DISEASES OF THE SKIN — continued. 



TAVUS, or honeycomb ring-worm — EXPERIMENTS OF GRUBT — THE 

 ACHORION SCHONLEINII — THE YELLOW CRUST DUE TO THE EXU- 



DATIOK TRANSMISSIBILITY OF THE DISEASE FROM ANIMALS TO 



MAN, AND riCH rSRSA TINEA CIRCINATUS THE TRICOPHYTON 



DISCOVERED BY MALMSTEN IDEJCIITY OF FAVUS AND TINEA 



CIRCINATUS — LETTER FROM MR. M'GILLIVRAY OF BANFF 



TREATMENT OF RING-WORM. 



DISEASES DUE TO VEGETABLE PARASITES — BERMATOPHYTA. 



The vegetable parasites, or epiphytes, whi^h cause diseases of 

 the skin, are microscopic growths belonging to the lowest class 

 of vegetable existence, namely, the funt/i o^yjitogamia. Most of 

 them are composed of simple Sporules, germs, or cells, placed 

 side by side, or end to end. 



Two forms of skin diseases traceable to vegetable parasites 

 are now pretty M'eU understood ; they are the tinea tonsurans, 

 also called tinea toudens or ring- worm, and favus, honeycomb 

 ring-worm, or scald-bead. 



FAVUS, OR HONEYCOMB RING-WORSL 



This is a disease little known in this country, and is'describtd 

 as a fungus parasitic disease, composed of cup-shaped scabs, 

 sometimes distinct and separate, at other times indistinct or 

 confluent. These fungi are capable of being implanted from one 

 animal to another, from man to animals, and animals to man; 

 and Gruby tried the effects of the inoculation of the parasite on 

 vegetables, and succeeded, by inoculating the bark of an oak- 

 tree, in getting a favus-cup identical with that which grows on 

 the heads of children. 



