66 VITALITY AND EFFICIENCY WITH RESTRICTED DIET. 



February 2, Squad A — continued. 



tive impressions regarding clothing, feeling of cold during experiment, 

 hunger, etc., recorded. Second (last) skin temperature measurements. 

 Fourth blood examination, Miss Gibson. Ninth clinical examina- 

 tion. Dr. Goodall. Third Du Bois body-surface measurements. 

 Fourth shadow photographs. Tenth experiment in group respi- 

 ration chamber. 



February 8, Squad A. In Boston; at Laboratory in morning. Last rectal 

 temperature and pulse-rate measurements with subject in post- 

 absorptive condition and in lying position. Standing experiments, 

 portable respiration apparatus, with records of pulse-rate; blood 

 pressure of subject standing. First treadmill experiments ; pulse-rate 

 standing, walking, and sitting. Blood pressure of subject standing 

 after walking and then sitting. No psychological measurements, but 

 strength of grip taken. Each man without food until the observa- 

 tions were completed, and then ate freely of food provided. No 

 observations of any kind with Squad A after this date except records 

 of body-weight, pulse-rates (not in post-absorptive condition), 

 strength of grip, and introspections. 



Feb. 8 and 9, Squads A and B. Interviews with men to obtain post-diet im- 

 pressions, and especially information regarding influence of low diet 

 on sex expression and tendencies. 



February 18, Squad A. Last bicycle ergometer experiments. 



February 20, Squad B. Last bicycle ergometer experiments. 



March 6, Squad B. Last records of pulse-rate by Professor Johnson, with sub- 

 ject in lying position and with food. 



March 7, Squad A . Last records of pulse-rate by Professor Johnson, with sub- 

 ject in lying position and with food. 



May 21 and 22. Information obtained about college grades of Squad A. 

 Interviews with six members of Squad A who still remained in college. 

 Records of body-weight, pulse-rate, and strength of grip secured. 



METHODS AND APPARATUS USED IN THE RESEARCH. 



While much of this research followed established usage with regard 

 to techniques, particularly in analysis, many of the procedures employed 

 were either so fundamentally novel or important modifications of pro- 

 cedures previously described that, for a clear understanding of the data, 

 it will be necessary to describe the techniques in considerable detail. 

 One must assume that it is not permissible to publish data secured by 

 an apparatus, technique, or method that has not been published or is 

 not simultaneously published. On this basis, therefore, the report of 

 this research must include the description of a considerable amount of 

 new apparatus. On the other hand, in order to make the picture per- 

 fectly clear, it seems desirable to record, at least in brief, the methods 

 employed for some of the simpler procedures, although no claim is made 

 for originality in any of these well-known techniques. 



The methods in the research as a whole may be classified under 

 several heads : the control, preparation, sampling, weighing, and analy- 

 sis of food; the collection, preservation, sampling, and analysis of 

 feces and urine; the grosser physical measurements, such as weight, 



