02$ PATHOGENIC MICROORGANISMS 



of a grayish color. In old cultures black granules appeared among 

 the mycelial meshes. 



On potato, he observed a dense velvety membrane, centrally of a pale 

 brown, white at the periphery. Small brown droplets appeared on the 

 growth in old cultures. 



Animal inoculation with this microorganism has so far been un- 

 successful. 



