TISSOT AND BENEDICT METHODS. 153 



of the periods; particularly in last two periods of experiment (with spirometer 

 unit). Average barometric pressure, 760.2 mm.; average temperature of air 

 in apparatus, 21.2° C. 



J. W. P., June 27, 1912. — Spirometer unit, 4 periods; Tissot apparatus, 2 

 periods; first two periods with spirometer unit, apparatus alternating there- 

 after. Pneumatic nosepieces used with both forms of apparatus and tested 

 for tightness with soapsuds. Pulse-rate very regular in all periods. Respira- 

 tion-rate regular in each period. Average barometric pressure, 766.2 mm.; 

 average temperature of air in apparatus, 21.8° C. 



J. K. M., June 20, 1912. — Tissot apparatus, 4 periods; spirometer unit, 

 4 periods; first two periods with Tissot apparatus, then apparatus alternating, 

 and last two periods with spirometer unit. Subject somewhat drowsy in 

 second period of experiment (with Tissot apparatus). Range of pulse-rate 

 from 4 to 5 beats per minute in all periods. Respiration-rate in all periods 

 regular. Average barometric pressure, 754.9 mm.; average temperature of 

 air in apparatus, 24.0° C. 



J. K. M., June 26, 1912. — Spirometer unit, 4 periods; Tissot apparatus, 

 3 periods; preliminary period, 46 minutes; first two periods with spirometer 

 unit, apparatus alternating thereafter. Subject drowsy in second period of 

 experiment (with spirometer unit), also in fifth period (with Tissot apparatus). 

 He said he preferred the Tissot apparatus because of absence of vibration. 

 Pulse-rate varied in different periods in range up to 5 beats per minute. 

 Respiration-rate regular in all of the periods; in last period with spirometer 

 unit somewhat irregular in depth. Average barometric pressure, 755.5 mm. ; 

 average temperature of air in apparatus, 28.6° C. 



«/. K. M., June 29, 1912. — Spirometer unit, 4 periods; Tissot apparatus, 

 3 periods; first two periods with spirometer unit, then apparatus alternating. 

 Nosepieces tested for tightness with soapsuds. Pulse-rate varying in range in 

 individual periods from 3 to 9 beats per minute. Respiration-rate regular in 

 all periods with both apparatus. Average barometric pressure, 755.6 mm.; 

 average temperature of air in apparatus, 27.4° C. 



E. W. H. June 24, 1912. — Spirometer unit, 3 periods; Tissot apparatus, 

 3 periods; first two periods with spirometer unit, then apparatus alternating, 

 last two periods with Tissot apparatus. Subject sat in a Morris chair, as his 

 respiration while lying on his back was so irregular and deep at times that it 

 was found impracticable to experiment with him in the latter position. Sub- 

 ject somewhat uneasy in several of the periods, especially in the fifth period 

 (with spirometer unit), when he moved considerably. This uneasiness 

 affected the results. Pulse-rate irregular and wide in range. Respiration 

 irregular and uneven in depth. Average barometric pressure, 762.1 mm.; 

 average temperature of air in apparatus, 27.9° C. 



E. W. H., June 28, 1912. — Spirometer unit, 4 periods; Tissot apparatus, 

 3 periods; first three periods and fifth period with spirometer unit; remaining 

 periods with Tissot apparatus. Subject sitting in chair. Nosepieces tested 

 with soapsuds. Subject said he liked the spirometer unit better than the 

 Tissot apparatus. Pulse-rate irregular, varying widely in the individual peri- 

 ods. Respiration somewhat irregular in depth and rate. Average barometric 

 pressure, 761.9 mm.; average temperature of air in apparatus, 24.6° C. 



J. H. H., April 14, 1913. — Spirometer unit, 3 periods; Tissot apparatus, 

 3 periods; preliminary period, 1 hour 14 minutes; periods with each apparatus 

 in series. Mouthpiece used. Pulse-rate fairly regular. Normal respiration- 

 rate, 19 per minute; 1 respiration during experiment uniform in character in 



*In the later experiments it was made a part of the routine to record the normal respira- 

 tion-rate before the experiment began. 



