. Carnegie Institution of Washington publication. 138 GASEOUS METABOLISM OF INFANTS. ratus described, but we have seen that this record does not give a comparative picture of the degree of activity of different infants. Consequently, for comparing the maintenance metabolism only periods in which the external muscular activity is eliminated should be used, since in the last analysis knowledge with regard to internal muscular activity is desired, uncomplicated by the increased metabolism due to external muscular activity. We believe that our evidence justifies us in asserting that we have two ad
. Carnegie Institution of Washington publication. 138 GASEOUS METABOLISM OF INFANTS. ratus described, but we have seen that this record does not give a comparative picture of the degree of activity of different infants. Consequently, for comparing the maintenance metabolism only periods in which the external muscular activity is eliminated should be used, since in the last analysis knowledge with regard to internal muscular activity is desired, uncomplicated by the increased metabolism due to external muscular activity. We believe that our evidence justifies us in asserting that we have two admirable indices for securing these ideal conditions of muscular repose for comparison, first, the graphic records obtained with the kymograph, and second, the pulse-rate. For comparing the metabolism of different infants, therefore, only those periods with records of complete muscular repose and with minimum pulse-rate can legitimately be employed. RELATIONSHIP BETWEEN PULSE-RATE AND METABOLISM. From the general pictures of the kymograph curves and the pulse curves, one may infer that the pulse-rate follows closely the muscular activity. Furthermore, since it has been shown that the relationship between the metabolism and the kymograph curves is comparatively constant, it is reasonable to expect that the pulse-rate will follow the metabolism. That this latter relationship is usually more nearly con- stant than the relationship between the metabolism and the record of the muscular activity is clearly indicated in a number of observations in which the kymograph record showed a complete absence of extrane- ous muscular activity, while the pulse records showed fluctuations. An excellent illustration of this may be seen in the pulse and kymo- graph curves which were obtained in the observation of February 1, 1913, with the infant L. B. (see figure 49). Thus between 4 p. m. and PERIOD - II COi per hr gms PERIOD - III C02 per hr gms Pulse 123 PERIOD - IV C02per hr gms P
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