128 



GASEOUS METABOLISM OF INFANTS. 



made under less favorable circumstances. Obviously the curves given 

 in figures 39 and 40 can not be directly compared with the long curves 

 obtained in the hospital wards, since the former were secured under 

 the absolutely uniform conditions obtaining in the respiration chamber 

 and in relatively short experiments. 



95 116 118 l09 



Fig. 40. Pulse-rate curves with infants of like weight, but of different ages. 



o, b, and c. M. D., March 14, 4.0 kilograms, 3 weeks, quiet, then moved, crying and moving, quiet, 

 moving, quiet, moving; F. M., January 22, 3.6 kilograms, 4 months, quiet, restless, restless 

 and crying; J. S., June 11, 4.1 kilograms, 5| months, moving slightly, fairly quiet then moved, 

 moving and crying. 



d and e. M. M., June 7, 5. 4 kilograms, 4| months, quiet, moving, moving and grumbling, moving 

 and crying; D. M., March 26, 5.2 kilograms, 11 months, quiet, moving and crying, moving, 

 moving and crying. 



/and g. P. W., April 1, 7.1 kilograms, 7 months, moving and grumbling, then quiet; R. L., May 

 16, 7.3 kilograms, 9 months, moving, then quiet. 



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

 OF THE SAME AGE BUT WITH DIFFEERNT BODY-WEIGHTS. 



Though the undeveloped, atrophic infants have a different reaction 

 of the pulse-rate to variations in muscular activity from those found 

 with normal infants, some of our data may still be used to throw light 

 upon the question of the differences in the reaction with different body- 

 weights. Curves have been plotted showing the changes in the pulse- 

 rate accompanying changes in body-activity from quiet to crying, or 

 the reverse, with a number of infants of the same age but with different 

 body-weight; these are given in figures 41 and 42. 



In only one of the comparisons is there a marked difference. The 

 infants L. O. (curve e, figure 42) and J. S., (curve /, figure 42), with 

 body-weights of 3.3 kilograms and 4.6 kilograms respectively, when 

 compared with P. W. (curve g, figure 42) with a body-weight of 7.1 

 kilograms, show apparently a greater rapidity in the return to the 

 normal than does the heavier infant. Little can be inferred from the 

 other comparisons. 



