PSYCHOLOGICAL PROGRAM AND TECHNIQUE. 137 



oxygen has been consumed than carbon dioxide has been formed, and since the volume of nitrogen 

 is unchanged, it is evident that at the start of the period these 100 volumes are altered to the follow- 

 ing: N2 (unchanged), 79.037 volumes; CO2 (by analysis), 0.143 volume; O2 (by computation above), 

 20.792 volumes; total, 99.972 volumes, of which the percentage of oxygen would be 



20 . 792 



^"' X 100 = 20. 798 



99.972 



The correct percentage of oxygen at the start is therefore 20.798. 



Volume of chamber at 0°, 760 mm. at start was 2,175.8 liters 



Log. volume of chamber at start of period 2,175.8 =3.33761 



" per cent O2, 20.798 9.31801-10 



" oxygen present at start 2.65562 =452.50 liters. 



(b) Oxygen present at end of period: 



By analj'sis with Sonden apparatus, per cent O2+CO2 =20.872 



By analysis with Haldane apparatus, per cent CO2 . 706 



Per cent oxygen present at end of period 20. 166 



Log. volume of chamber 0°, 760 mm., at end of period, 



2.177.9 =3.33804 



Log. per cent oxygen at end 20.166 9 .30462-10 



Log. volume oxygen at end of period 2 . 64266 =439 . 20 liters. 



Liters. 



, Oxygen present at start of period 452 . 50 



Oxygen present at end of period 439 . 20 



Oxygen consumed 13 . 30 



Duration, 20 minutes. 



Oxygen consumed per minute, 665 c.c. 



Respiratory quotient, ?= =0.92. 



O2 665 

 1,000 c.c. CO2 at respiratory quotient of 0.92=5.378 cals.;i e. g., 614 c.c.=3.30 cals. 



PSYCHOLOGICAL PROGRAM AND TECHNIQUE. 



The measurements of the neuro-muscular processes and the general 

 mental condition of the men in Squads A and B were made at the 

 Nutrition Laboratory when the men were in Boston, Saturday even- 

 ings and Sunday mornings. This arrangement of bringing the squads 

 to Boston was a particularly advantageous one for the psychological 

 phase of this research, as it made possible the securing of a maximum 

 amount of data in the time at our disposal, with the least interference 

 with the college duties of the subjects. Moreover, by doing this part 

 of the work at the Nutrition Laboratory conditions were obtained 

 which were more suitable and uniform throughout the experimenta- 

 tion than they would probably have been elsewhere. The students 

 were away from their usual college environment, with its numerous 

 interests and distractions. The college work for the week was com- 

 pleted. Since the men were all present and had no other duties or 

 engagements than to serve as subjects in the psychological and other 

 measurements, it was unnecessary to make individual appointments 

 for an experimental session, a condition which unavoidably gives rise 



1 Benedict and Talbot, Carnegie Inst. Wash. Pub. No. 201, 1914, p. 29. 



