IIl4 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 2 in. 
objective. A higher power is unnecessary. 
Fic. 20.—Microsporon Audouini.* 
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 microsporon Audouini 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). : 
