Abstract
Summary
1. The rate of respiration of a given volume of embryonic blood gradually decreases from the 14th to the 20th day of incubation. From this time until 29 days after the onset of incubation (the greatest age investigated) it remains virtually constant. 2. It is suggested that the decrease in respiratory rate is due to a decrease in the number of young cells having a high respiratory rate and a hemoglobin with a lesser affinity for oxygen. 3. Methylene blue shows no catalytic effect on the rate of respiration of embryonic blood of the chick. It will, however, counteract the inhibitory effect of KCN when present.
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