STUDIES ON FERMENTATION. 



105 



Aspergillus glaucus. 



Growth with abundant air-supply 

 at the edge of the mycelium crust. 



Growth with reduced air-supply 

 in the central and deeper parts of 

 the mycelium. 



Mucor racemosus. 



Growth with abundant air-supply 

 at the edge of the mycelium tuft. 



Fig. 



Growth with reduced air-supply 

 in the central and deeper parts. 

 21. 



