1923] 



CAMP— CITRIC ACID AS A SOURCE OF CARBON 



279 



solution 1, almost one-half more, but it is noticeable that the 

 peak of growth occurred after all the dextrose had disappeared, 

 in solution 2, but was coincident with its disappearance in solution 



,ely so. Likewise, the weight of the mats fell off 



1, or approximately so. 



much more rapidly in solution 1 than 



Here 



there was a greater weight of mat in solution 2 when the dextrose 

 disappeared than in solution 1 at the same relative period. 



Cu/r.4, Soi>,. l 





Payf J 



1 



Fig. 12. Diplodia nalalensis in solution 1. 



The disappearance of dextrose came at about the same 



period, in both 



The data for solution 1 would indicate 



that 



compounds were formed 



of carbon 



dextrose 



>:> 



The 



proceeds 



below the base line for the first 8 days, indicating that a small 

 amount of waste products was probably formed from the dextrose. 

 Beginning on the ninth day this curve begins to rise rapidly, 

 and from this noint runs practically parallel to the curve calculated 



es. Likewise, the point at which the curve 

 oss of dextrose' ' starts to ascend is coin- 

 cident with the final disappearance of dextrose from the solution. 



from the titration figu 

 for ''loss of carbon — 



