Abstract
Experiments with 1200 cc. of a 24-hr. culture proved that the rate of respiration remained constant at 78% O for 41/2 hrs. O concentration was 60-90% for 61/2 hrs. as shown by 8 CO2 determinations. The O:N ratio (78% 0) giving maximum rate of respiration is the same as that in the nitrate ion.

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