188 VITALITY AND EFFICIENCY WITH RESTRICTED DIET. 



difficulty in later counting the finger movements or measuring the reac- 

 tion time. The subject used right or left hand as desired, but the same 

 hand in all sessions. The apparatus was in full view while the record 

 was made. The small "make" and "break" sparks from the trans- 

 former could be seen jumping from the recording-point. There was 

 every opportunity to rest the hand from strain of position during the 

 intervals between records, when the subject's attention was taken up 

 with other matters.^ 



Fig. 54. — The form of the right-angle maze. 

 The subject began in the center and worked outward on the black pattern. 



(16) Efficiency in Traversing a Right-angle Maze. 



In connection with another research, a complete description of which 

 is not likely to be published, it was desired to provide a motor test in 

 which the subject, while looking at something which corresponded to a 

 map, would be required to carry out a series of movements in accord- 

 ance with definite rules. For this purpose two identical right-angle 



^ Previous to the reduced-diet research, finger-movements of the same nature were taken 

 at the Nutrition Laboratory in other connections. These were recorded photographically, the 

 arm and hand supported by the adjustable rest shown at the left of the subject in fig. 22, p. 152. 

 The fingers were connected to two light systems of levers, which may be seen in front of the 

 camera. Electrocardiogram pulse records were taken at the same time and incorporated in the 

 same records. Sample records of this character may be seen in other publications (Miles, 

 Carnegie Inst. Wash. Pub. No. 266, 1918, p. 96, fig. 11; Dodge and Benedict, Carnegie Inst. 

 Wash. Pub. No. 232, 1915, p. 171, fig. 28.) 



