Lewis Knudson 



169 



8 

 9 

 10 

 11 

 12 

 13 

 14 



TABLE III. 

 Organism, Aspergillus niger. 



Organism, Penicillium sp. 



gallic acid prevents the utilization of the gallic acid from being 

 made manifest. 



If the Aspergillus niger and Penicillium sp. cultures are com- 

 pared, one finds that the tannic acid in the Aspergillus culture is 

 transformed to the extent of 81 per cent by the tenth day; whereas 

 in the Penicillium cultures this transformation, for the correspond- 

 ing time, is only 53.3 per cent of the tannic acid. Moreover, by 

 the fourth day the gallic acid had increased in culture No. 2 by 

 nearly 0.5 gram, while in culture No. 8, for a corresponding time, 

 there was a decrease of galhc acid. With this concentration and 

 temperature, therefore, the Aspergillus niger is a more vigorous 

 fermentative organism than Penicillium sp. 



If now the time factor and amount of growth be examined in 

 their relation to the gallic acid, it is found that with the above 

 solutions and under the specified conditions, the gallic acid de- 

 creases after the sixth day and is utilized in the further metabolism 

 of the organism. ' 



