114 BACTERIOLOGICAL DIAGNOSIS. 



Decolorise with anilin oil, pouring it off and applying 

 a fresh lot from time to time. The process may take an 

 hour or more, and the specimen should be left under the 

 microscope and examined occasionally. 



When the decolorisation is complete (i.e., when the 

 color is seen to be present in the fungus only), blot 

 gently, and wash thoroughly with xylol. Mount in 

 balsam. 



The specimens are to be examined under an ^ in. 

 objective. A higher power is unnecessary. 



FIG. 20. Microsporon Audoui'ni.* 



There are certainly three, and possibly more species 

 of ringworm which occur in England, and the fungus 

 of favus is closely allied and is demonstrated by the 

 same process. 



The microspovon Audou'ini is the most common species 

 of ringworm fungus in this country, being responsible 

 for about eighty or ninety per cent, of all cases. It is 

 the small spored fungus, and it may be distinguished 

 by the fact that its spores are arranged in an irregular 



* Figs. 20, 21, 22 are from Curtis's "Essentials of Bacteriology" 

 (Longmans). 



