[Vol. 10 



278 



ANNALS OF THE MISSOURI BOTANICAL GARDEN 



soluble barium salt and very weak acidity, for the titration fig- 

 ures fell to 1.1 cc. of N/10 NaOH per 25 cc. of solution, and the 

 P H to 7.2. These facts preclude most of the common acids and 

 trive the inmression that it was some other inert substance. 



Fig. 11. Pemcilhum digitutum in solution 2. 



Divlod 



In figs. 12 and 



f 



for the analytical work and in fig. 8 the curves i 

 trend of P H during the period of growth. The soli 

 this fungus was the same as that used for organism 

 NILNO» was substituted for KNOi. 



used for 



There was considerably greater growth in solution 2 than 



