496 VITALITY AND EFFICIENCY WITH RESTRICTED DIET. 



values can be referred, we have also the heat output of the squad as a 

 whole prior to diet restriction, which was obtained in the night experi- 

 ments made with the Boston group respiration chamber in accordance 

 with the previously described technique. (See p. 92.) 



Measurements were made with both Squads A and B. These 

 extremely trying experiments were carried on throughout the night 

 with the special assistance of Miss Alice Johnson and with the intelli- 

 gent cooperation of the Misses Inza A. Boles, Mildred A. Corson, 

 Mary F. Hendry, Mary D. Finn, and on two nights, Mrs. Dorothy 

 A. Peabody. In addition we wish to acknowledge the services of Mr. 

 George L. Wall, whose care and fidelity in the preparation and testing 

 of the large number of sulphuric-acid and soda-lime bottles made 

 it possible for us to carry out this lengthy series of experiments without 

 a single loss due to defective reagents or faulty containers. 



With Squad A the results of only one night basal experiment are 

 available, since it was necessary to begin the diet restriction shortly 

 after this experiment was made. With Squad B the results of a number 

 of night experiments are available, as the men were brought to Boston 

 at intermittent periods prior to the beginning of the diet study with 

 this squad the first week in January. Hence we have an exceptionally 

 good measure of the basal metabolism of Squad B on normal diet. It 

 is furthermore of importance to note that this represents the only 

 measurement of the normal basal metabolism of Squad B, since indi- 

 vidual metabolism measurements for basal values were not obtained 

 with these men, Ham being the only man in Squad B who was thus 

 studied. Likewise, subsequent to dietetic restriction, no individual 

 respiratory exchange experiments were made with any member of 

 Squad B. Hence our whole interpretation of the gaseous metabolism 

 of this squad is based solely upon the measurements made with the 

 group respiration chamber. The measurements of Squad A, however, 

 supply supplementary evidence regarding the basal metabohsm, and 

 the changes in metabolism induced by restricted diet. 



Unfortunately the personnel of Squads A and B changed somewhat 

 from night to night. An ideal plan would have been to have had 

 always the same individuals throughout the entire period. This was 

 impossible for a number of reasons, as illness, the drafts for military- 

 service, and other calls away from college interfered more or less 

 with the use of the men as subjects. Hence it is important for us to 

 consider primarily in discussing the values obtained with the group 

 respiration chamber the values per kilogram of body-weight and per 

 square meter of body-surface. On these bases the values are, con- 

 sidering the homogeneity of the group, reasonably comparable. The 

 total amounts measured are not comparable, owing to differences in 

 personnel and differences in weight. 



