134 



GASEOUS METABOLISM OF INFANTS. 



the body-weight of A. L. was but little more than that of J. V., the kymograph 

 curve for the former showed a distinctly greater amplitude and more frequency 

 of movement and the metabolism was also greater. This demonstrates in an 

 interesting manner the fact that A. L. was a more vigorous infant than J. V. 



Observation with F. M., February 20, 1913. 



Another infant, F. M., with a body-weight of 3.86 kilograms, showed 

 unusually persistent activity throughout practically the whole of the obser- 

 vation on February 20, 1913 (see figure 46). The observation began at 3 h 18 m 



3f 



=1 



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* Kf ^> *^tf *tf t-H ,>4,*^* w *«f» M + ^ f 



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-77! = 



L tin lMirMhhi i - ji A Mut* 



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FEB.20.I9I3 



Fig. 46. Kymograph curve for F. M., February 20, 1913. 



p. m., but the activity continued throughout two lengthy periods, i. e., until 

 4 h 42 m p. m.; two reasonably quiet periods were subsequently obtained, with 

 an activity of III and II respectively. As would be expected, the heat- 

 production during the preliminary and first periods, when the activity was 

 VI, was very large, being 535 calories per 24 hours in the preliminary period 

 and 528 calories per 24 hours in the first experimental period (see table 27). 

 In the period from 4 h 42 m p. m. to 5 h 12 m p. m., when the activity was III, 

 the heat-production fell to 346 calories per 24 hours and the previous high 

 pulse-rate of 141 and over dropped to 119. In the last period, that from 



Table 27. — Comparison of the pulse-rate, metabolism, and muscular activity in observation 

 with F. M., February 20, 1913. 



♦Preliminary period. 



5 h 12 m p. m. to 5 h 42 m p. m., when the activity was slightly less and charac- 

 terized as II, the pulse-rate fell but one point and the total heat-production 

 was 334 calories per 24 hours. It will be seen that in this observation, also, 

 the muscular activity, the pulse-rate, and the total katabolism follow almost 

 parallel courses. Inasmuch as this infant was considerably heavier than either 

 J. V. or A. L., the amplitude of the vibration of the pointer and the activity 

 in general can not logically be used as indications of the body condition or 

 strength of the infant except as showing that he should not in any sense be 

 considered as weak. 



