[Vol. 10 



276 



ANNALS OF TOE MISSOURI BOTANICAL GARDEN 



doing so and the final decline in weight was correspondingly 

 slower. The dextrose had disappeared 2 days earlier in solution 

 1 than in solution 2, and if the mat curves were smoothed out 

 there would be about that much difference between the times of 

 attaining the maximum weight of mat in the 2 solutions. Appar- 

 ently these maximum weights had been attained shortly before 

 the dextrose was completely used up. This is uncertain, however, 



Fig. 9. Penicillium digital um 9 weight of mats. 



since in such a case as that in fig. 10 there was a slight amount of 

 dextrose on the eighth day and none on the tenth day, but if the 

 curve for the loss of dextrose be calculated according to the con- 

 formation of the curve previous to the eighth day, the disappear- 

 ance of dextrose would be found to occur some time on the eighth 

 day or near the beginning of the ninth day. 



The presence of the peptone in the solution complicates the 

 problem of drawing conclusions from the data obtained. The 

 remarkable fact in connection with solution 1 (fig. 10) is that the 

 curve for the loss of carbon seems to tally almost absolutely with 

 that for the loss of dextrose, and would consequently make it 

 appear that little or none of the easily oxidizable carbon in the 



