1 See table 36 for experiment on December 19, 1911.

2 The thermal junction rectal thermometer was used during the work periods and during the lying periods following. The body-temperature rose about 1° C. and after work fell to about the original level. (See Fig. 10, p. 158.)

3 Work was begun at 9h 30m a.m. The metronome was used, set at 60. The pulse-rate during the preliminary period was at 9b 35m a.m., 100; at 9h 42m a.m. and 9h 46m a.m., 104; at 9h 48m a.m., 102. The speed of the rotary blower was increased during work. Perspiration appeared on the subject's brow at 9b 57m a.m.

Approximate. The metronome was used to regulate the speed.

5 The metronome was set at 58. At 10h 18m a.m. there was sweat on the subject's lips as well as on his brow. He found the work easy and felt in excellent condition.

6 Work was finished at 10h 40m a.m. The subject then readjusted the rectal thermometer and immediately lay down.

1 The rectal thermometer was used on this day but was not inserted during work. The records show that a rise in the body temperature of about 0.9° C. occurred during work. During the second series of lying periods there was a steady fall totaling about 1.6° C. (See Fig. 10, p. 158.)

2 The subject lay down at 7h 55m a.m. The pulse-rate at 7h 57m a.m. was 66; at 8h 02m a.m., 64; at 8h 07m a.m., 58. From 8h 10m a.m. to 8h 17m a.m. the average pulse-rate was 60.

In the third period the position of the mouthpiece was twice altered for the subject because it was not as comfortable for him as usual.

4 The subject rode at the average rate of 107 revolutions per minute from 9h 22m a.m. to 9h 47m a.m., when the speed was lowered to 60 revolutions per minute. The pulse-rate could not be observed during the rapid riding because the subject could not wear the stethoscope harness. It took him till 9h 38m a.m. to get his second wind. During the preliminary period following 9h 47m a.m., the pulse-rate was 132, 128, 124, 128. During the rapid riding the speed went as high as 135 revolutions per minute. Approximate. The metronome was used to regulate the speed.

The subject complained of saddle soreness. After the rate was lowered to 60 revolutions per minute, the metronome was used to regulate the speed. He said the ergometer was different from the ordinary form of bicycle. While at work he was annoyed at having to keep time with the metronome. The crank of the bicycle was working loose, and that also annoyed him and interfered with the smoothness of his work.

The subject stopped work at 10h 35m a.m. His respiration was now shallow, though regular. He was tired, and there was tendency, therefore, to loosen the mouth on the mouthpiece.

1 The rectal thermometer was used during this entire experiment. During work there was a maximum rise of about 1.2° C. in the body-temperature; during the lying periods following the work periods it fell steadily to the temperature at the beginning of the day. (See Fig. 10, p. 158.)

2 The subject lay down at 7b 57m a.m. The pulse-rate at 8h 10m a.m. was 66; at 8h 20m a.m., 61; at 8h 22m a.m., 60. 8 The windows were opened, and the subject rode rapidly from 9h 28m a.m. to 9h 53m a.m. The speed during

this rapid riding was probably about the same as on Dec. 21. At 9h 53m a.m. the speed was reduced to 60 revolutions per minute. The pulse-rate at 9h 57m a.m. was 120; at 10h 04m a.m., 122; at 10h 08m a.m., 120. The measurement of the metabolism was attempted at 10h 10m a.m. but the subject stopped work after 1 minutes. He said he could not continue because of the great pressure from the rubber cap on the tension-equalizer which affected his expiration. The pulse-rate was 112 at 10h 10m a.m. There was no flushing to speak of. There was considerable perspiration, but this was due to the previous exercise. The subject stopped pedaling for about 3 minutes and said he was much exhausted. He had very labored breathing. During the period which was successfully carried out between 10h 20m a.m. and 10h 30m a.m., the test for carbon dioxide in the circuit was positive. The amount of carbon dioxide present was small, but the blower was run for 3 minutes after the period to clear it out. 4 Approximate. The metronome was used in both work periods and during the interval between the two periods to regulate the speed.

1 See table 43 for experiment on Jan. 1, 1912.

2 Before the experiment the subject complained of a heavy feeling in his stomach.

It was possibly due to the fatty supper of the night before. He looked well. The pulse-rate at 8h 10m a.m. was 68; at 8h 20m a.m., 63; at 8h 42h a.m., 62.

3 Beginning at 9h 31m a.m., the subject rode rapidly for 25 minutes at the average rate of 110 revolutions per minute. At 9h 56m a.m. the speed was lowered to 60 revolutions per minute. The pulse-rate after the speed was decreased was at 10b 01 a.m., 134; at 10h 04m a.m. and 10h 07m a.m., 130; at 10h 09m a.m., 132. The subject washed his mouth by gargling with water at 10h 07m a.m. He said then that he could start all over again with ease.

4 Approximate. The metronome set at 60 was used to regulate the speed from 9h 56m a.m. to the end of work.

5 The subject was in excellent condition and had no difficulty in doing the work. There was a tendency in both periods for him to fall off from the set rate of 60 revolutions per minute.

6 The subject lay down at 10h 45m a.m.

7 The subject moved actively for about 10 seconds at 11h 51m a.m.

1 See table 42 for experiment on January 2, 1912.

2 During the interval there were 28 minutes of hard work followed by 14 minutes of work at 60 revolutions per minute. The records of speed at 9h 52m a.m. and 10h 12m a.m. were 95 and 98 revolutions per minute. Second wind after 16 minutes. Pulse-rate during the preliminary work with the speed at 60 revolutions was 145, 124, 128.

3 Approximate.

4 The subject had 5 minutes' complete rest sitting on the bicycle after the last experiment. He started again at 10h 45m a.m., at a speed of 60 revolutions per minute.

TABLE 44.-Results with subject M. A. M. (without food).

1 The subject lay down at 7h 55m a.m. The pulse-rate at 8b 12 a.m. was 68; at 8b 16m a.m., 66; at 8h 19m a.m., 64; at 8h 22m a.m., 63.

2 Beginning at 9h 29m a.m. the subject rode rapidly for 25 minutes at the average rate of 119 revolutions per minute. At 9h 54m a.m. the speed was lowered to 60 revolutions per minute. The subject washed his mouth by gargling while riding fast. He perspired freely and felt winded just before he finished the fast riding. He rode fastest at first, i. e., about 136 revolutions per minute. Second wind at 9h 33m a.m. The pulse-rate was obtained after the speed was decreased as follows: at 9h 59m a.m., 152; at 10h 05m a.m., 144; at 10h 09m a.m., 144. During the period itself there were symptoms of collapse at the end of 7.5 minutes and the period was therefore ended as soon as possible. There was twitching of the subject's lips but no leak.

3 There was a possible trace of carbon dioxide in the circuit by test.

4 Approximate. The metronome set at 60 was used to regulate the speed from 9h 54m a.m. to the end of work. The subject looked all right and said he was quite ready to continue the work. The work was easily done. TABLE 45.-Results with subject M. A. M. (without food).

1 The subject lay down at 7h 55m a.m. Pulse-rate at 5-minute intervals after 8h 10m a.m. was 66, 64, 64, 64. 2 The subject rode rapidly for an hour after the first lying period, not breathing in the circuit of the respiration apparatus. At times he rode much more rapidly, as high as 140 revolutions per minute. Work was finished at 9h 50m a.m. The subject then lay down pouring with perspiration, and was rubbed down. He had to rest a little and rested with his mouth on the mouthpiece from 9h 53m a.m. to 9h 55m a.m., when the period began. He lay very quietly.

At the end of the preceding period the subject was still thoroughly bathed in perspiration. His arms and chest were rubbed down and his flannels were removed for comfort.

1 The subject lay down at 8 a.m. 62; at 8h 22m a.m., 60.

The pulse-rate at 8h 11m a.m. was 62; at 8h 15m a.m., 62; at 8h 19m a.m.,

2 The subject rode rapidly for an hour after the first lying period, not breathing in the circuit of the respiration apparatus. He rode more rapidly at times, once at the rate of 153 revolutions per minute. Work was finished at 9h 51m a.m. There was very great perspiration after the work. Subject was rubbed down before he lay upon the couch. He lay very quietly, his respiration being shallow and rapid. There was no evidence

3 The apparatus was carefully tested for tightness before the period was started. that the mouth was not kept closed.

4 The apparatus was again tested carefully. The subject asserted that in both previous periods his lips and his nose (held by noseclip) were absolutely tight. He complained that he was extremely hungry.

TABLE 47.-Results with subject M. A. M. (without food).

1 A new and larger wooden wheel had been put on the motor and a smaller wheel or rim of the blower was used. The ventilation was increased from about 60 liters per minute to about 82 liters per minute.

2 The subject had a slight cold but otherwise felt and looked to be in good condition.

3 The subject began work at 9h 24m a.m. and to the beginning of the period he rode at the average rate of 92 revolutions per minute.

4 The subject had no difficulty in breathing. The machine was not running at just the second the subject was brought into the circuit. It was started immediately. The subject rode at the average rate of 100 revolutions per minute between the two periods.

5 Work was finished at 10h 33m a.m. The subject was then rubbed down and lay on the couch at 10h 37m a.m. TABLE 48.-Results with subject M. A. M. (without food).

1 The subject had great difficulty in walking over to the laboratory and fell twice because of the icy street. He said he was not much inclined to work. He lay down at 8h 10m a.m. The pulse-rate at Sb 19m a.m. was 64; at 8h 23m a.m., 60; at 8h 27m a.m., 60.

2 Work was begun at 9h 17m a.m. Between 9h 17m a.m. and 9h 40m a.m. the average speed was 109 revolutions per minute. From 9h 25m a.m. to 9h 32m a.m. the subject was riding at the rate of about 130 revolutions per minute. He was directed to ride more slowly and reduced the speed to about 90 revolutions per minute. During the period itself the subject was not looking well and the period was therefore ended after 9 minutes. A test made during the period showed that carbon dioxide was passing the soda-lime. The subject said he did not feel as well as on Jan. 8, but could have completed 10 minutes.

3 The average speed between the two periods was 97 revolutions per minute.

4 Work was finished at 10h 32m a.m. The subject's respiration was shallow during this period.

1 See table 52 for experiment on January 10, 1912. 2 The subject lay down at 8 a.m.

3 Work was begun at 9b 25 a.m. Between 9h 25m a.m. and 9h 40m a.m. the subject rode at the average speed of 97 revolutions per minute, though in the first 6 minutes he rode at the rate of 136 revolutions per minute. During the period evidence of carbon dioxide in the circuit was found after about 6 minutes. The subject's speed was distinctly held down after the carbon dioxide was found to be passing the sodalime. Before that the speed was well above 120 rev. per minute, rather of a strain for the subject. 4 One record, at the wrist.

5 Between the two periods (about 32 minutes) the subject rode at the average rate of 95 revolutions per minute. At one time he rode 90 revolutions in one-half minute. 6 Work was finished at 10b 38m a.m.

TABLE 50.-Results with subject M. A. M. (without food).

1

The subject lay down at 8h 02m a.m.

2 Work was begun at 9h 28m a.m.

The pulse-rate was 64 at 8h 10m, 8h 15m, and 8h 25m a.m.

Between 9h 25 a.m. and 10h 05m a.m. the average speed was 107 revolutions per minute; at times it was as high as 126 revolutions per minute. There was no difficulty of any kind during the period, except in keeping the subject down to a low level of work. There was always a tendency to sprint.

3 At the wrist.

4 Between the two periods the subject rode at the average rate of 85 revolutions per minute. It was difficult to prevent the subject from doing too much work during this period.

5 Work ceased at 10h 40m a.m. and the subject lay down at 10h 43 a.m.

TABLE 51.-Results with subject M. A. M. (without food).

1 Work was begun at 9h 19m a.m. Between 9h 19m a.m. and 9h 35m a.m. the subject rode at the average rate of 110 revolutions per minute during the actual time of riding. In the first 5 minutes the average speed was 131 revolutions per minute. He stopped for a minute at 9h 26m a.m. to urinate. The subject felt that he was in splendid condition.

2 One record, at the wrist.

3 Between the two periods the subject rode at the average rate of 86 revolutions per minute.

4 Work was finished at 10b 31m a.m. There was delay in starting the first rest period because of the time required to remedy a leak. The apparatus was finally pronounced tight after repeated testing.