1 See table 49 for experiment on January 16, 1912.

2 The subject lay down at 8h 05m a.m. The pulse-rate at 8h 14m a.m. was 68; at 8h 20m a.m., 8h 23m a.m., and 8b 25m a.m., 64.

3 Work was begun at 9b 16m a.m. The average speed from 9b 16m a.m. to 9h 47m a.m. was 118 revolutions per minute, though the subject rode as rapidly as 136 revolutions per minute. The speed at 9h 41m a.m. was about 120 revolutions per minute, when he slowed down, by direction, to about 83 revolutions per minute. The subject said he felt in excellent condition while at work, and he looked as if he were. 4 One record, at the wrist.

5 Between the two periods the subject rode at the average speed of 86 revolutions per minute, though much of the time he rode as rapidly as 95 revolutions per minute. At the beginning of the second period through accident the rotary blower was not started and therefore for about one-half minute the subject rebreathed while hard at work. He showed all the usual symptoms of impending collapse. As soon as the rotary blower was started and a liberal allowance of oxygen was given, the symptoms disappeared very rapidly. After that he continued the work with ease.

TABLE 53.-Results with subject M. A. M. (without food, following 1 day with carbohydrate

poor diet).

1 The subject said the muscles of his body were stiff and he felt as if he needed a rubdown. He lay absolutely still during the period.

2 Work was begun at 9h 18m a.m. Between 9h 18m a.m. and 9h 33m a.m. the subject rode at the average rate of about 104 revolutions per minute, though for the first 5 minutes he rode at the average rate of 134 revolutions per minute.

3 Between the two periods the subject rode at the average speed of 87 revolutions per minute. During the period the work was carried out with comparative ease, though the subject looked much fatigued at the end. He did not walk easily.

4 Work ceased at 10h 22m a.m. The subject was then rubbed vigorously with liniment and towels and lay down at 10h 28m a.m. He lay very quietly. He made the statement that he was very tired and hungry and felt just as if he had ridden 100 miles.

TABLE 54.—Results with subject M. A. M. (without food, following 2 days with carbohydrate

poor diet).

1 The subject complained that he felt stiff and tired and had no particular inclination to work. feel like "breaking any records." He lay very quietly.

He did not

2 He lay very still. There was some disturbance because of several people coming into the room toward the end of the period. His attention was also taken up with preparations being made for taking samples of his alveolar air. 3 Work was begun at 9h 20m a.m. Between 9h 20m a.m. and 9h 32m a.m. the subject rode at the average speed of 95 revolutions per minute, though for the first 5 minutes he rode at the rate of 114 revolutions per minute. Carbon dioxide was found to be passing the absorbers at 9h 40 a.m. because of very poor soda-lime. The subject had all the symptoms of impending collapse. He said he could go on, but the period was ended.

4 Between the two periods the subject rode at the average rate of 76 revolutions per minute, more rapidly at first. At 10 07m a.m. he rode 94 revolutions in one-half minute. At 10h 24m a.m. carbon dioxide was detected passing the absorbers. The subject was not looking well, and the period was therefore ended. As in the preceding period the soda-lime was found to be poor.

5 Work ceased at 10h 25 a.m. The subject felt very hungry at about 10 p.m. the night before. He felt tired when rising time came, and lacked energy. During the week he felt very tired and was disinclined to exert himself. In the half minute (10b 07 a.m.) in which he did exert himself, the effort was too great. He could not work as hard as usual and felt that he had somehow lost his strength. He was very hungry. Samples of his alveolar air were taken at about 10h 10m a.m. during work and at 10h 26m a.m., 10b 45m a.m., 11b 05m a.m., 11b 30m a.m., and 11b 57m a.m., after the work was finished.

TABLE 55.—Results with subject M. A. M. (without food, following 3 days with carbohydrate

poor diet).

1 Between the first and second periods samples of alveolar air were taken, causing the subject to move his body somewhat on the couch. The same movements of the body occurred on Jan. 18, when the samples were taken.

2 Work was begun at 9h 52m a.m. Between 9h 52m a.m. and 10h 05m a.m. the subject rode at the average speed of 94 revolutions per minute, during the first 5 minutes at the rate of 113 revolutions per minute. He found the work extremely hard and fatiguing and thought he had broken all his previous records. Between the two periods the subject rode at the average speed of 68 revolutions per minute. At about 10h 30m a.m. he rode 98 revolutions in 30 seconds. The work was apparently laborious. The subJect was positive that he was doing far harder work on this day than on earlier days when his diet was varied in character. He denied that he would not work because he thought the food was not right for him. He said that he was putting forth the best that was in him. The subject felt more tired than ever after work. 4 Work ceased at 10b 59m a.m. Between 5 and 10 minutes later samples of alveolar air were taken. A number of samples of alveolar air were taken during the day while the subject was lying before work, sitting on the ergometer before work, during work, and while lying after work.

TABLE 56.-Results with subject M. A. M. (without food, following 1 day with carbohydrate

rich diet).

1 Work was begun at 9h 43m a.m. Between 9h 43m a.m. and 9h 55m a.m. the subject rode at the average rate of 106 revolutions per minute; in the first 5 minutes at the rate of 119 revolutions per minute. The work in the period seemed to be readily done. The subject complained that he found the work harder than at the close of the last experiment on Jan. 19. He thought he was out of practice.

2 Between the two periods the subject rode at the average rate of 83 revolutions per minute. At 10h 24m a.m. he rode 91 revolutions in one-half minute.

3 Work ceased at about 10h 46m a.m.

4 The respiration was extremely irregular and very shallow.

TABLE 57.-Results with subject M. A. M. (without food, following 2 days with carbohydrate

Carbon

rich diet).

1 Work was begun at 9h 47m a.m.

of 96 revolutions per minute.

Between 9h 47m a.m. and 9h 59m a.m. the subject rode at an average rate

2 Between the two periods the subject rode at the average rate of 88 revolutions per minute. At 10h 28m a.m. he rode 91 revolutions in one-half minute. Work was finished at 11 01m a.m.

TABLE 58.-Results with subject M. A. M. (without food, following 3 days with carbohydrate

1 Work was begun at 9h 23m a.m.

Between 9h 23m a.m. and 9h 37m a.m. the subject rode at the average rate of 89 revolutions per minute, but at the rate of about 96 revolutions per minute between 9b 23m a.m. and 9h 33m a.m.

2 Between the two periods the subject rode at the average rate of 80 revolutions per minute. Once before the period he rode 97 revolutions in one-half minute. Work ended at 10h 35m a.m. The subject said

after the period that he felt very tired and exhausted.

1

The subject lay down at 8 a.m. The pulse-rate at 8b 20m a.m. was 72; at 8h 24m, 8h 27m, 8b 32m a.m., it was 68. 2 Work was begun at 9h 48m a.m. and for 5 minutes the subject rode at the rate of 112 revolutions per minute. After that the riding was somewhat interrupted because of blowing of fuses and about 8 minutes was lost from work. Sweating was profuse, but not abnormally so.

3 One record, at wrist.

4 After the preceding period work was stopped for about 21 minutes due to an accident in testing the resistance of the ergometer. During this time the subject sat quite still on the bicycle, without working. Work was resumed at 10h 36m a.m. The subject felt cold and physically less fit. He had lost all his eagerness, whereas he had felt in good riding condition before. Between 10h 44m a.m. and 11 a.m., when the second period began, he rode at the average rate of about 85 revolutions per minute.

5 Work was finished at 11h 12m a.m. The subject coughed once or twice in the first "lying" period, and swallowed a little saliva.

6 The subject was very sleepy and there was a tendency for the lips to relax. The lips were plastered up firmly.

7 Mouth was plastered up.

1 The subject put his mouth to the mouthpiece 17 minutes before the first period was begun.

2 Work was started at 9h 35m a.m. Between 9h 35m a.m. and 9h 48m a.m. the subject rode at the average rate of about 96 revolutions per minute.

3 One record, at the wrist.

At

4 Between the two work-periods the subject rode at the average rate of about 73 revolutions per minute. 10h 13 a.m. he rode 103 revolutions in one-half minute and was in consequence very much exhausted. The subject said he felt in splendid form for work.

5 At the wrist.

6 Work was finished at 10h 46m a.m. The subject lay down at 10h 50m a.m.

7 The subject took 3 or 4 very long deep breaths during this period. He said he felt the need of breath. He was absolutely unable to urinate after the experiment."

1 The subject lay down at 8h 05m a.m. The pulse-rate at 8h 27m a.m. was 68; at 8h 32m a.m., 66.

2 Work was begun at 9h 49m a.m. Between 9h 49m a.m. and 10h 03m a.m. the subject rode at the average rate of 109.5 revolutions per minute. A portion of the time he rode as rapidly as 126 revolutions per minute.

3 One record at the wrist.

4 Between the two periods the subject rode at the average rate of 93 revolutions per minute. Part of the time he rode as rapidly as 113 revolutions per minute. During the period the handle-bars were loo8ened. The subject became restless because of the swinging of the loose bars. He also had trouble with the pedals.

5 At the wrist.

6 Work was finished at 11h 03m a.m.

7 The subject's respiration was very shallow and irregular.

8 The subject rose from the couch at 2h 24m p.m. and walked about slowly, stretched himself, and then lay down. The total time used for these operations was one and one-half minutes. The pulse rate at 2b 30m p.m. was 78.

9 The subject was tired and hungry at the end of the experiment. He was also suffering from cramp of the lips, owing to the fact that he had held his mouth to the mouthpiece so frequently.

1 The experiment of Feb. 6 was made following several days with ordinary diet, and was a test of the flexible connection for the mouthpiece. This connection was not used in the first four periods; it was used in the last three periods.

2 Pulse at 8h 23m a.m. was 64; at 8h 27m a.m., 64.

3 After 1 day with carbohydrate-poor diet.

4 Work was begun at 9h 44m a.m. Between 9h 44m a.m. and 9h 59m a.m. the subject rode at the average rate of 105 revolutions per minute. During the first 5 minutes he rode at the rate of 121 revolutions per

minute. He did not feel that he was in as good condition as during the preceding week, though he was very fit.

5 Between the two periods the subject rode at the average rate of 89 per minute.

6 Work was finished at 10h 57m a.m. Subject lay down at 11h 03m a.m.