TISSOT APPARATUS WITHOUT AUTOMATIC COUNTERPOISE. 221 



periods with and without automatic counterpoise in series. In periods with- 

 out automatic counterpoise, tube less than half full of water. Nosepieces 

 used in first period; mouthpiece in other periods. Pulse-rate uniform in all 

 series. Average respiration in preliminary period, 20 per minute. In second 

 period respiration wavy in character but normal in other periods. Sections 

 of respiration curves snowing the two types of respiration are given in figure 

 73. Subject stated that he preferred mouth-breathing to nose-breathing, but 

 noted no difference between the two methods, except that he was more tired 

 in the latter part of the morning. Average barometric pressure, 757.9 mm. ; 

 average temperature of air in apparatus, 18.8 C. 



W. J. T., March 8, 1913. Without automatic counterpoise, 4 periods; with 

 automatic counterpoise, 3 periods; preliminary period, 49 minutes; periods 

 with and without automatic counterpoise alternating for the most part. In 

 periods without automatic counterpoise, no water in counterpoise and no 

 water running in siphon. Mouthpiece used throughout experiment, but in 

 third period no noseclip was used. Subject stated that he noted no difference 

 in the two methods. The results obtained in the last period for the carbon- 

 dioxide elimination and oxygen consumption are not included in the average, 

 as the sample of air analyzed appears to have been contaminated with outside 

 air. Pulse-rate fairly uniform in all periods. Average respiration-rate in pre- 



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FIG. 73. Types of respiration of subject W. J. T. in third and second periods on March 1, 1913. 

 Note the irregular character of the respiration shown in the lower curve. Original size. 



liminary period, 20 per minute. During experiment, respiration-rate irregular 

 at times, particularly in fifth period. Average barometric pressure, 770.0 

 mm. ; average temperature of air in apparatus, 16.8 C. 



W. F. B., March 10, 1913. With automatic counterpoise, 3 periods; without 

 automatic counterpoise, 2 periods; preliminary period, 46 minutes; periods 

 with and without automatic counterpoise alternating. No water in counter- 

 poise tube and none running in siphon. Subject quiet and awake throughout 

 experiment. Pulse-rate uniform in all periods. Average respiration-rate in 

 preliminary period, 11 per minute; between periods, average rate was 10, 9, 

 10, 10, and 9 respectively; during periods, regular in rate and even in char- 

 acter. Average barometric pressure, 765.1 mm.; temperature of air in appa- 

 ratus, 17.1 C. 



W. F. B., March 12, 1913. Without automatic counterpoise, 3 periods; 

 with automatic counterpoise, 3 periods; preliminary period, 42 minutes; 

 periods with and without automatic counterpoise alternating. No water in 

 counterpoise tube and no water running through siphon. Pulse-rate uniform 

 throughout experiment. Average respiration-rate in preliminary period, 

 9 per minute; between periods, 6, 9, 8, and 9 per minute, respectively; during 

 experimental periods, respiration-rate very regular in character. Subject 

 stated that during first period he found it difficult to breathe in and out; after 

 third period he complained of a pain in left side of body which he thought was 

 due to the pneumograph; the pneumograph was therefore loosened and moved 

 to a lower point on the body, after which he said he felt more comfortable. 



