APPENDIX. 



TABLE I. 



THE PERCENTAGE OF OXYGEN WHICH IS EQUIVALENT TO THE NlTROGEN FOUND 



IN THE EXPIRED AIR. 



To obtain the nitrogen in the expired air, add the percentage of COz and C>2 

 found and subtract the sum from 100. The table gives the percentage for O 2 

 corresponding to this figure: 



%N 2 78.7 78.8 78.9 79.0 79.1 79.2 79.3 79.4 79.5 79.6 79.7 79.8 



79.9 80.0 80.1 80.2 80.3 80.4 80.5 80.6 

 %O 2 20.86 20.88 20.90 20.93 20.96 20.98 21.01 21.04 21.07 21.10 21.12 21.14 



21.16 21.19 21.22 21.25 21.28 21.31 21.35 21.38 



TABLE II. 



TENSION OF AQUEOUS VAPOUR IN MILLIMETRES OF MERCURY. 

 To obtain the dry barometric pressure, subtract the mm. Hg. corresponding to 

 the temperature of the air from the barometric pressure at the time of the experi- 

 ment: 



Temp. 15C. 16 17 18 19 20 21 22 23 24 25 

 Mm. 12.7 13.5 14.4 15.4 16.3 17.4 18.5 19.7 20.9 22.2 23.5 



TABLE III. 



TEMPERATURE CORRECTIONS TO REDUCE READINGS OF A MERCURIAL 



BAROMETER WITH A BRASS SCALE TO C. 



Subtract the appropriate quantity as found in table from the height of the 

 barometer. The table is for a barometer with a brass scale, and the values are a 

 little lower (about .2 mm.) than for the glass scale. The corrections for inter- 

 mediate temperatures can be approximated. 



