680 



THE PARASITES OF RINGWORM 



One preparation should be gently heated to show the situation of the parasite 

 in relation to the hair. Another should be heated until the liquid just begins 

 to boil in order to dissociate the hair and show the structure of the parasite. 



FIG. 322. Culture of the white tricophyton from an horse. 

 (After Bodin.) 



Conidia. 



Epithelial scales should be first teased with needles and then treated as 

 above. For preparing stained preparations, Sabouraud selects thin scales, 

 which should be washed with chloroform to remove the fat, then boiled for 

 2 or 3 minutes in formic acid, washed in distilled water and stained in Sahli's 

 borax blue for 1 minute. 



*r ? IQ V 323 /T~ A ringworm-infected hair after treatment with caustic potash. 

 JNpte the fringe at the junction of the shaft with the soft bulb. (From a 

 photograph kindly lent by Dr. H. G. Adamson ) 



