PSYCHOLOGICAL PROGRAM AND TECHNIQUE. 149 



Edward S. Mills, whose thorough understanding of the apparatus and 

 intelligent cooperation as assistant in psychological investigations dur- 

 ing the last few years insured care in execution. 



The measurements made by the group method and the three series 

 of individual measurements just outlined made up the evening psycho- 

 logical session. No effort was made to have the men serve as subjects 

 in identical order each evening, nor was it expedient to give tests in the 

 same order to the individual subjects each evening. 



In addition to the measurements made in the evening, a number of 

 tests were made in the morning after the subjects had spent the night 

 in the group respiration chamber. At these morning sessions, also, the 

 subjects were taken in an order which was most convenient to them- 

 selves. The distinctive measurements for the morning session were: 

 Nos. 7, 9, and 14, that is, changes in pulse rate with exertion, reaction 

 time of the eye, and speed of eye movement. These were all in room C, 

 and required the attention of an experimenter and an assistant, Mr. 

 Mills. Finger-movement records, pulse counts, and strength of grip 

 records were taken by a second assistant, Mr. Waldron, in room B. 

 The subjects were called, dressed, ate their breakfast, and came to be 

 tested in groups of 3. It required about 20 to 25 minutes for each 

 group. A particular subject began with room B or C, as was conven- 

 ient for the experimenter. One subject served at a time in room B, two 

 were tested simultaneously in room C — one for the pulse measurements 

 and the other for the eye measurements. The first subjects were 

 ready at 6^30™ a. m. When they had completed the measurements at 

 about 7 a. m., they left the Laboratory not to return until the next 

 session, usually two weeks later. The last subjects tested were ready 

 to leave the Laboratory about 8^30™ a. m. 



The individual measurements as distributed between the evening and 

 the morning sessions and in the three rooms are therefore as follows : 



Evening : 



Room A. 



6. Strength of grip. 



11. Continuous discrimination and reaction in finding serial numbers. 



16. Efficiency in traversing a right-angle maze. 



17. Efficiency in performing certain clerical tasks. 

 Room B. 



8. Latency, amplitude, and refractory period of patellar reflex. 

 10. Reaction time for speaking 4-letter words. 



15. Speed of the finger movements. 

 Room C. 



12. Sensory threshold for visual efficiency. 



13. Sensory threshold for electric shock. 

 Morning: 



Room C. 



7. Changes in pulse-rate occasioned by short periods of exertion. 



9. Reaction time for turning the eye to a new point of regard. 



14. Speed of the eye movements. 

 Room B. 



15. Speed of the finger movements. 

 6. Strength of grip. 



