OTHER SKIN DISEASES lOI 



pulp. Allow some of this pulp to dry on one of the slides, fix, 

 stain by Gram's method, and do not counterstain. If the film is 

 very greasy, so that the stain does not wet it, warm the slide 

 gently and allow a few drops of ether to flow over the film, fix 

 again, and proceed as before. Examine the preparation under 

 a y^2^-inch. The presence of the bottle bacillus is almost conclusive 

 evidence in favour of seborrhcea, as against psoriasis, syphilis, etc. 



The figure (Plate IV., Fig. 6) I owe to the kindness of 

 Dr. Whitfield. It is from an impure culture, the only one that 

 has ever been obtained. 



Tinea Versicolor. — There is usually no difficulty in the diag- 

 nosis of this disease by ordinary clinical methods. Where there is 

 any doubt, one of the scales may be removed and examined in liquor 

 potassse, or by any of the methods described for ringworm. 

 The fungus — M. furfur — ^is readily detected under a ^-inch. It 

 consists of rather wide mycelial threads, branching and inter- 

 lacing, with masses of refractile spore, looking like bunches of 

 grapes (Plate IV., Fig. 4). 



