4 CONTENTS. 



Comparison of respiratory exchange — Continued. page. 



Tissot apparatus and Benedict respiration apparatus (spirometer unit) 150 



Statistics of experiments 152 



Discussion of results 154 



Douglas respiration apparatus and Benedict respiration apparatus (spirometer 



unit) 161 



Statistics of experiments 162 



Discussion of results 166 



Mouth- and nose-breathing with the Benedict respiration apparatus (tension- 

 equalizer unit) 173 



Statistics of experiments 173 



Discussion of results 175 



Mouth- and nose-breathing with the Benedict respiration apparatus (spirometer 



unit) 179 



Statistics of experiments 180 



Discussion of results 181 



Mouth- and nose-breathing with the Tissot apparatus 184 



Statistics of experiments 185 



Discussion of results 185 



Mask and nosepieces with the Benedict respiration apparatus (spirometer unit) . . 189 



Statistics of experiments 189 



Discussion of results 191 



Glass and pneumatic nosepieces with the Benedict respiration apparatus (spirom- 

 eter unit) 193 



Statistics of experiments 193 



Discussion of results 194 



Mueller valves and Tissot spirometer and the Benedict respiration apparatus 



(spirometer unit) 195 



Statistics of experiments 195 



Discussion of results A 196 



Mueller valves and Tissot valves 200 



Statistics of experiments 201 



Discussion of results 202 



Benedict respiration apparatus (spirometer unit) with and without additional dead 



space 206 



Statistics of experiments with an increase in dead space of 45 c.c 207 



Statistics of experiments with an increase in dead space of 90 c.c 209 



Statistics of experiments with an increase in dead space of 135 c.c 210 



Statistics of experiments with an increase in dead space of 224 c.c 213 



Discussion of results 213 



Tissot apparatus with and without automatic counterpoise on the spirometer bell . 219 



Statistics of experiments 220 



Discussion of results 222 



Part III. 



Critical discussion of respiration apparatus and their technique 227 



Benedict universal respiration apparatus 227 



Zuntz-Geppert apparatus 234 



Tissot apparatus 240 



Douglas method 248 



Valves 250 



Breathing appliances 252 



Pneumatic nosepieces 253 



Glass nosepieces 254 



Mouthpiece 255 



Mask 256 



Gas analysis 257 



Accuracy and interpretation of results 260 



