“…In each experiment, duplicate basal gas collections were made several times, the first after 30 to 40 minutes and the second after 51 to 66 minutes of rest. The results, presented in Table I, indicate that the respiratory quotient reached a constant level in one-half hour in experiments 1, 2, and 3 but not in experiment 4. The respiratory data of the first experiment, therefore, cannot be interpreted, and will be presented only for those days on which 2 preliminary runs were made.…”