656 



JOHN K. MURLIN 



In strong contrast with these are the figures obtained by Sonden and 

 Tigerstedt upon groups of 6 boys. and girls of approximately the same age. 

 The authors state that their purpose was to obtain data which would be 

 of value in determining the ventilation requirements of public assembly 

 halls and especially school rooms. Their subjects were required to sit as 

 still as they would in school, but were permitted to handle and read books 

 and at times to nibble candies and fruits. Their results follow : 



TABLE 38 

 METABOLISM OF CHILDREN SITTING AS 12* SCHOOL (Sonden and Tigerstedt) 



BOYS 



GIRLS 



* In view of the fact that the children of this series were permitted to eat candy 

 and fruit at times while in the respiration chamber a R. Q. of 0.90 is assumed, 

 i.e., the CO a is given a heat value of 5.471 Cals. per liter. 



The heat production here is calculated upon the assumption of a K. Q. 

 cf 0.90 employing the values for C0 2 given by the authors upon the basis 

 of a square meter of surface. The results are nearly double those obtained 

 by Olin. Benedict and Talbot have calculated the heat production per 

 kilo and 24 hours of these subjects on the assumption of a K. Q. of 0.90 

 and these values are shown for comparison upon a chart (Fig. 44) pre- 

 pared by them to exhibit the basal metabolism according to several authors. 

 The average distance of the individual points designated as the "active 

 subjects of Sonden and Tigerstedt" above the continuous line representing 

 the average basal may be taken as approximating the activity metabolism 

 occasioned by sitting at a desk reading a book and making such minor 

 movements as a well-behaved child in school would make during study 

 periods. This amounts to fully 30 calories per kilogram and 24 hours, 

 table 38 shows a very marked difference between boys and girls which is 



