394 REPORT OF OFFICE OF EXPERIMENT STATIONS. 



A suniiniuy of data ro«ijar(lin<; diotary conditions in the United 

 States jMd)lislied by the Department of A«;rirulture lias been referred 

 to elsewhere (sec p. 3S6). The dietary standard suf^<2;ested in this 

 summary calls for 100 grams of protein and 3,500 calories of enerfjy 

 in the food eaten per man per day. Attention is especially directed 

 in this report to the difTerence between dietary standards and 

 physioloj^ical requirements, the former being simply guides for home 

 and institution management. 



STUDIES OF THE PHYSIOLOGY OF GROWTH. 



Fundamental in their importance and in their relation to questions 

 of nutrition are the extremely valuable series of investigations on 

 the chemistry of growth reported from the laboratory of the Sheffield 

 Scientific School of Yale University, by Mendel and his associates." 

 The papers which have already appeared deal very largely with the 

 enzj^ms of different tissues in embryonic life. The investigations 

 have been summarized by Mendel ^ and some general deductions 

 have been drawn. 



Many studies of growth have also been reported by Waters,'' then 

 of the Missouri Experiment vStation, and by S. H. Gage and Miss 

 Susanna Gage, of Cornell Universit}', "^ while recent contributions to 

 the subject have been discussed and data summarized by Pearl, of 

 the Maine Experiment Station.* 



EXPERIMENTS WITH THE RESPIRATION CALORIMETER AND 



OTHER TECHNICAL STUDIES. 



On the more technical side of nutrition work much has been 

 accomplished. The report of experiments made by F. G. Benedict 

 and R. D. Milner / with their respiration calorimeter in 1903 and 

 1904, as part of nutrition investigations of this Office, was published 

 about the beginning of the period included in this summary. Like 

 the reports of previous investigations with the respiration calori- 

 meter, this bulletin furnishes important data regarding the trans- 

 formations of matter and energy in the body, the demands of the 

 body for nutriment, the effects of muscular work upon such demands, 

 and the actual nutritive value of different kinds of food materials 

 and their ingredients. The results of eleven experiments, with five 

 different men as subjects, are reported in which the balance of income 



a Amer. Jour. Physiol., 20 (1908), No. 1, pp. 81, 97, 117; 21 (1908), No. 1, pp. 64, 

 69, 77, 85, 95, 99. 



b Bio. Chem. Ztschr., 11 (1908), No. 4, p. 281. 

 c Proc. Soc. Prom. Agr. Sci., 29 (1908), p. 71. 

 <i Science, n. ser., 28 (1908), No. 719, p. 494. 

 «Amer. Nat., 43 (1909), No. 509, p. 302. 

 /U. S. Dept. Agr., Office Expt. Stas. Bui. 175. 



