304 CARNEGIE INSTITUTION OF WASHINGTON. 



ing than that deduced from the individual minima. Probably weighting 

 with the square root of the number of days rather than with the number of 

 days would be the course recommended by most statisticians. 



(6) The quantitative measurement of static control in standing. W. R. Miles. Am. 



Journ. Physiol., vol. 55, p. 309 (1921). 



An abstract published in the Proceedings of the American Physiological 

 Society, describing the static-control recorder, together with some results 

 obtained by its use. 



(7) The energy requirements of girls from 12 to 17 years of age. Francis G. Benedict and 



Mary F. Hendry. Boston Med. and Surg. Journ., vol. 184, pp.»217, 257, 282, 297, 

 and 329 (1921). 



Almost no evidence has hitherto been available regarding the energy 

 requirements of girls of 12 to 17 years of age. With the cooperation of the 

 Mavssachusetts Girl Scouts, nine groups of girls, usually 12 in a group, were 

 studied on different nights inside of a large respiration chamber at the Nutri- 

 tion Laboratory. The pulse-rate, insensible perspiration, and particularly 

 the carbon-dioxide production throughout the entire night were determined 

 frequently in 30-minute periods. The minimum values found throughout 

 any given night have been taken as the basal requirement. This varies con- 

 siderably in the different groups, although the total heat-production of the 

 average girl remains strikingly uniform, irrespective of age or weight. Since 

 the older girls are heavier than the younger ones, it is clear that the heat- 

 production per unit of mass, i. e., per kilogram, is greater with the younger 

 girls. The average, minimum, resting pulse-rate per minute of these girls 

 from 12 to 17 years of age was found to be 81 at 12 years, 77 at 13 years, 77 at 

 14 years, 83 at 15 years, 71 at 16 years, and 74 at 17 years. The insensible 

 perspiration per kilogram of body-weight per hour was 0.72 gram at 13 years, 

 0.71 gram at 14 years, and 0.77 gram at 15 years. The respiratory quotients 

 of these groups of girls, about 7 to 8 hours after a light meal, were 0.81, 0.81, 

 0.78, and 0.79. The caloric requirement during 10 hours of "bed rest" 

 was, on the average, 55.0 calories per individual per hour. The average 

 24-hour basal heat-production was 1,250 calories per individual, irrespective 

 of age. The heat-production per kilogram of body-weight per 24 hours 

 decreases regularly with increasing age, from 29.9 calorics at 12 years 2 months 

 to 21.7 calories at 17 years. The curve indicating the general metabolic 

 trend is throughout its entire length materially below the few scattered ob- 

 servations of earlier writers. The heat-production per square meter of body- 

 surface per 24 hours likewise decreases, but not so regularly, with increasing 

 age, ranging from 928 calories at 14 years to 745 calories at 16 years. The 

 metabolism of groups of young girls can be predicted from the general curve 

 indicating the heat-prod action per kilogram of body- weight referred to age 

 to within an average error of ±3.1 per cent. The prediction for the heat- 

 production per unit of body-weight is somewhat better than that per unit of 

 surface-area. The curves representing the heat-production per Idlogram of 

 body-weight referred to weight and per square meter of body-surface referred 

 to weight for these groups of girls from 12 to 17 years of age blend with re- 

 markable uniformity with similar curves based upon the measurement of a 

 large number of normal girls from birth to 12 years of age. No influence of 

 puberty or the prepubescent stage is clearly proved in any of the results. 



(8) The basal metabolism of girls 12 to 17 years of age. Francis G. Benedict, Mary F. 



Hendry, and Marion L. Baker. Proc. Nat. Acad. Sci., vol. 7, p. 10 (1921). 



An abbreviated presentation of the material in the foregoing article. 



