152 * 



media, this organism should become irreversibly converted into the 

 common denitrifying species, Baderium Stutzeri. ' 



It seems probable that younger microbiologists will be inclined to 

 cover these later publications of Beijerinck with the cloak of 

 charity; older workers in the field who are more familiar with the 

 tricky ways in which variation may manifest itself will be led to 

 wonder : senescence or accumulated wisdom ? 



