120 



GASEOUS METABOLISM OF INFANTS. 



although not a perfectly smooth line, indicates no major movements. 

 Another instance of fluctuating pulse-rate unaccompanied by changes 

 in the kymograph record is seen in the period between 5 h 10 m p. m. 

 and 5 h 30 m p. m. We thus have a general indication of uniformity 

 between the pulse curve and the kymograph record, with a possibility 

 of considerable fluctuation in the pulse-rate which is unaccompanied 

 by external muscular activity. This feature will receive special con- 

 sideration later. 



t lH N - f \ 





E.N 



MAY 23. 1913 



Fig. 21. Pulse-rate and kymograph curves for E. N., May 23, 1913. 



An examination of the 193 kymograph records obtained in this series 

 of experiments with infants shows the same general uniformity between 

 the pulse-rate and the muscular activity as do the two specimen sets 

 of observations given in figures 20 and 21. There are, however, a 

 sufficient number of well-defined instances of alterations in the pulse- 

 rate, unaccompanied by changes in muscular activity, to justify the 

 assumption that an increase in pulse-rate is not necessarily a result of 

 extraneous activity. 



As further evidence of the uniformity between muscular activity 

 and pulse-rate, particularly during periods of restlessness, we present in 

 figures 22 to 37 comparisons of portions of kymograph and pulse-rate 

 curves obtained with a number of subjects. This collection of kymo- 



