PSYCHOLOGY: W. R. MILES 
153 
urday evenings and Sunday mornings when the men were in Boston for the 
bi-weekly group metabolism experiment in the large respiration chamber. 
After a standard evening meal the subjects came to the laboratory and 
were available during a period of approximately four hours. Of this time 
about one hour was spent on measurements which could be given to the men 
as a group. This was done in the library where table space and other con- 
ditions were adequate. Particular attention was given to the matter of 
lighting. The men were assigned seats which they occupied at each session 
although it was not believed that one location in the room was more favorable 
than another for the group experiments. A considerable period was allowed 
for preliminary adjustments, announcements, questions and a general quieting 
of the men before beginning the evening session. 
The first measurement was a test of accuracy or steadiness of movement in 
tracing between parallel lines with many right-angle turns. The tempo was 
set by the metronome beating half seconds. The subject was instructed to 
start at a signal, to avoid contact with the boundary lines, and to make one 
straight line for each beat of the metronome. Each contact with a boundary 
line was counted an error. 
Other measurements which could be suitably given by the group method 
were : Discrimination for the pitch of tones, using tuning forks and resonators as 
source (150 judgments); discrimination and cancellation of specified number 
groups on a printed page of numbers, the task being to mark each pair of 
successive digits which, when added, equaled 11; the addition of one-place 
numbers arranged in columns of ten during a test period of ten minutes; and 
the memory span for lists of 4-letter English words pronounced in tempo and 
without stress. 
Psychological measurements of men on reduced diet 
Group Method: 
1. Accuracy in tracing between irregular parallel lines. 
2. Discrimination for the pitch of tones. 
3. Discrimination for specified number groups on a printed page. 
4. Addition of one-place numbers for a period of ten minutes. 
5. Memory span for 4-letter English words. 
Individual Method: 
6. Strength of grip; hands tested alternately. 
7. Changes in pulse rate occasioned by short periods of exertion. 
8. Latency, amplitude and refractory period of the patellar reflex. 
9. Reaction time for turning the eye to a new point of regard. 
10. Reaction time for speaking 4-letter words. 
11. Continuous discrimination and reaction in finding serial numbers. 
12. Sensory threshold for vision. 
13. Sensory threshold for electric shock. 
14. Speed and accuracy of the eye movements. 
15. Number of finger movements performed in ten seconds. 
16. Efficiency in traversing a right-angle maze. 
17. Speed and accuracy in performing certain clerical tasks. 
