DISCUSSION OF RESULTS. 



127 



EFFECT OF CHANGES IN ACTIVITY ON THE PULSE-RATE WITH INFANTS 

 OF THE SAME WEIGHT BUT DIFFERENT AGES. 



In order to compare the effect of changes in activity on the pulse- 

 rate of infants of the same weight but of different ages, a number of 

 pulse curves are given in figures 39 and 40, these being grouped ac- 

 cording to weight. These curves, like those previously shown, indicate 

 the rapid reaction of the pulse-rate with the change in activity, the reac- 



118 93 



Fig. 39. Pulse-rate curves with infants of like weight but of different ages. 



a and b. G. S., February 19, 3.3 kilograms, 2§ months, crying and moving, then quiet; E. S., 



March 22, 3.0 kilograms, 5 months, moved and cried, moving, then quiet. 

 c and d. A. C, March 19, 3.0 kilograms, l£ months, quiet, moved, cried lustily, crying, quiet; A. L., 



June 16, 3.1 kilograms, 3^ months, quiet, then moving and crying. 

 e and/. A. C, March 19, 3.0 kilograms, lh months, moved, cried lustily, crying, then quiet; E. S., 



March 21, 3.0 kilograms, 5 months, quiet, moved, moving and crying, then quiet. 

 and h. G. S., February 14, 3.2 kilograms, 2£ months.moved and cried, restless.then quiet (asleep?)-' 



K.R., April 5, 3.1 kilograms, 4 months, moving and crying lustily, moving and crying, then quiet, 

 i and;'. A. C, March 19, 3.0 kilograms, 1^ months, quiet, moved, cried lustily, crying, quiet; L. O., 



February 28, 3.1 kilograms, 6 months, quiet, moved, moving and crying, moving a little. 



tion being at times so rapid that we may reasonably question the accu- 

 racy of the record. The evidence given in these curves seems on the 

 whole to indicate that the rapidity of the return to normal after crying 

 and the increase when the infant waked up and cried are essentially the 

 same with all of the infants, irrespective of age. This evidence does 

 not agree with the results obtained in the earlier observations which were 



