DISCUSSION OF RESULTS. 



119 



to 3 h 36 m p. m., and that the last period from 5 h 07 m p. m. to 5 h 31 m 

 p. m. was also sufficiently quiet to be characterized as activity II 1 . 

 The remainder of the time the infant was quite active, so that experi- 

 mental observations of the minimum metabolism were impossible. A 

 close examination of the kymograph and pulse curves shows that there 

 is a striking parallelism between them. Thus, from 3 h 03 m p.m. to 

 about 3 h 16 m p. m., the infant was restless, with a high pulse-rate, while 

 between 3 h 16 m p. m. and 3 h 36 m p. m., the activity was at a minimum 



»,.>*» HW^H ' i|« »M H + » i »H»H» « +uH« * » «N>»f 



_±_V ^y. - ^ |'/;,vwww» ■ jiIVIWaw-— 



E.R 



APRIL 12.1913 



Fig. 20. Pulse-rate and kymograph curves for E. R., April 12, 1913. 



and the pulse-rate was low. About 3 h 39 m p. m. the pulse-rate again 

 rose, the rise being accompanied by increased external activity. This 

 reached a maximum about 4 o'clock and a period of decreasing activity 

 followed until the infant became quiet at about 5 h 7 m p. m. From 

 that time until it waked up, just before the end of the observation, the 

 infant was quiet with a minimum pulse-rate. Thus we see complete 

 uniformity in both curves. 



A second set of curves, which was obtained with E. N. on May 23, 

 1913, is given in figure 21. These curves also show a general paral- 

 lelism between the activity and the pulse-rate, with an apparently 

 anomalous condition between 4 h 25 m p. m. and 4 h 40 m p.m. At this 

 time the pulse-rate was distinctl y higher, while the kymograph reco rd, 



iFor a discussion of the method adopted for designating the various degrees of muscular 

 activity, see p. 130 and 136. 



