EXPERIMENT STATION BULLETINS. 



367 



phate and asparagin, while the other one remained without any further 

 addition (Rahn, Centralblatt f. Bakteriologie II, Bd. 20, p. 48). 



CO2 PRODUCTION IN DEXTROSE SOLUTION WITH Ca CO3 AND SOIL. 



The curve Fig. 16 shows the better nourished culture to be far ahead of 

 the other culture for the first six days; but at the eighth day, they are 

 alike and after that the culture without phosphate produces a good 

 deal more CO, than the one with phosphates. 



Figure 11, illustrating nitrification with and without dextrose, would 

 probably give the same results if the experiment had been continued 

 longer. At the end of 27 days, the soil with 0.5% dextrose is probably 

 not very far from the maximum, as we can tell by the declining curve; 

 the soil with 0.2% dextrose exceeds the first one a little; this may. 



Fig. 16. COz-Fdrmatiwi hy Soil Bacteriu loith Plentiful and Scanty 



Food. 



