Pulse-Bate. 131 



the pulse-rate to decrease during the progress of the fast. Taking this fact 

 into consideration, the daily averages still show marked variations. With the 

 subject A. H. M. there was likewise a marked difference in the average pulse- 

 rate which ranges from 40 to 63. Yet to all external appearances the man 

 was living under the same conditions of bodily activity and without food. The 

 observations with this subject for the most part were taken by means of the 

 pneumograph. With the remaining subjects in this table, the average pulse- 

 rate for each individual is much alike in the different experiments, indicating 

 a uniformity that is not observed with the subjects of a greater number of the 

 experiments in the first part of the table. In the later experiments the ex- 

 clusive use of the pneumograph may increase the accuracy of the pulse-records. 



IN EXPERIMENTS WITH FOOD. 



The larger number of experiments were with food, and the results for the 

 different individuals experimented with are given in table 51. All of the 

 results with E. 0. were obtained by the subject's own observation, and the uni- 

 formity in the averages for the different experiments is very striking. Perhaps 

 the most careful count of pulse, when made by the subject himself, was in the 

 experiments with J. F. S. Here, in different experiments, there were varia- 

 tions from 73 to 84, and yet the subject was living during this time under 

 identical conditions re^ardina; muscular activity, and the diet was essentiallv 

 the same in amount, although varying somewhat in the proportion of carbo- 

 hydrates to fat. The amount of protein in the diet remained essentially con- 

 stant in all experiments. 



One of the most striking illustrations of the variations in the pulse-rate with 

 the same individual is in the experiments with H. L. K. On February 20, 

 1905, during an experiment when he was taking an examination inside the 

 respiration chamber, the average pulse-rate was 96. During the control experi- 

 ment on March 1, 1905, it dropped to 78, and in 3 subsequent experiments it 

 varied from 74 to 81 ; the grand average for this man is taken as 75. The 

 subject A. H. M. was used in a large number of experiments, and fortunately 

 in most of these the determination of the pulse-rate was made by means of the 

 pneumograph. In the first experiment the pulse was extraordinarily low, i. e., 

 45 per minute. In subsequent experiments the average was as high as 73. 

 The grand average for this man was taken as 60. With H. E. D. there is 

 likewise a variation in the pulse-rate, ranging from 59 to 85. The average for 

 this subject was 70. 



