736 



DISEASES OF THE SKIN. 



consists ill tlie destruction of the cryptogamic plant. This is 

 effected by the application to the spots— after first removing 



Fig. 1^7. — Microscopic appearance of ring-worm crust after the 

 addition of liquor potassffi. a, a, Large branch of the achorion, 

 showing thalli in an advanced condition, with sporules arranging 

 themselves end to end. b, c, Hair containing the plant in an early 

 stage of development : at b the fungus is distinctly seen in the 

 centre of the hair-tube ; at c, the hair is represented as yet uninvaded 

 by the parasite. d, d, Scattered sporules. e, e, Hair irregularly 

 enlarged, with its cortical layer broken down by the growing parasite. 

 200 diameters. 



the crusts by washing the parts with warm water, soft soap, 

 and carbonate of potash — of the iodine ointment. To prevent 

 a recurrence of the disease, the stable should be thoroughly 

 cleaned and whitewashed, the harness and collars carefully 

 washed with soap and water, then brushed over with a solution 

 of iodine or corrosive sublimate, and the clothing of the animal 

 boiled. 



