278 MICROBES, FERMENTS, AND MOULDS. 



worm, Trichophyton tonsurans of cirinnate herpes, and 

 'Microsporon furfur of variegated pityriasis, are only 

 diflferent forms of one and the same parasite, of which 

 he has made a successful culture on gelatine, repro- 

 ducing its successive appearances. 



Grawitz, however, goes further than many miero- 

 graphists wiU consent to follow him. He asserts that 

 all the fungi of the human skin are only trans- 

 planted forms, modified by the medium, of Oidium 

 lactis, the white mould found on milk, bread, paste, 

 potatoes, etc. 



So, again, Oidium albicans, the fungus of thrush, 

 is, as we have said, specifically identical with Sac- 

 charomyces mycoderma, or flowers of wine, a ferment 

 which is developed on the surface of liquids which 

 are acid and contain little sugar. This must not be 

 confounded with Mycoderma aceti, a true bacterium, 

 causing the acid fermentation of wine and beer. 



Still more recently, in 1883, Malcolm Morris and 

 G. C. Henderson have stated that in an artificial 

 culture of peptonized gelatine at the temperature of 

 from 1.5° to 20°, spores of Trichophyton tonsurans were 

 developed, forming ramified hyphse which were after- 

 wards covered with fructifications resembling those of 

 Penicillium. 



Injections of Mould-spores into the Blood. — Grawitz 

 injected spores of Penicillium and Aspergillus into 

 the vascular system of rabbits, with the view of 

 demonstrating their transformation into bacteria. He 



