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COMPARISONS OF RESPIRATORY EXCHANGE. 



first period, suggesting apnoea; in second period, the type persisted but less 

 apparent than in first period; in third period, but little, if any, of this type of 

 respiration; respiration uniform otherwise throughout periods with this appa- 

 ratus. Rate of preliminary ventilation for 30 liters first period and 20 liters 

 second and third periods with Zuntz-Geppert apparatus: 



L. E. E., July 14, 1910. Tension-equalizer unit, 3 periods; Zuntz-Geppert 

 apparatus, 3 periods; apparatus alternated. Pulse-rate counted three times 

 in each period; uniform in most of the periods, except in the first with the 

 Zuntz-Geppert apparatus, when the range was from 47 to 54 in the three counts. 

 Respiration-rate obtained with pneumograph. In first period with each appa- 

 ratus, respiration-rate comparatively uniform. In second period with tension- 

 equalizer apparatus, there was a tendency toward irregularity and a wave-like 

 respiration, i. e., at intervals subject took a deep breath and the depth of respi- 

 ration would then gradually decrease; in second period with Zuntz-Geppert 

 apparatus, there was a very decided irregularity, approaching Cheyne-Stokes 

 respiration. In third period with each apparatus, respiration-rate compara- 

 tively uniform. Rate of preliminary ventilation for 20 liters with Zuntz- 

 Geppert apparatus: 



H. L. H., July 16, 1910. Zuntz-Geppert apparatus, 3 periods; tension- 

 equalizer unit, 3 periods; apparatus alternated. Pulse-rate counted three 

 times in each period; respiration-rate obtained with pneumograph uniform 

 in character. Rate of preliminary ventilation for 20 liters with Zuntz- 

 Geppert apparatus: 



H. L. H., July 26, 1910. Zuntz-Geppert apparatus, 3 periods; tension- 

 equalizer unit, 3 periods; preliminary period, 30 minutes; apparatus alternated. 

 Subject said there was only a slight resistance to respiration in periods with 

 Zuntz-Geppert apparatus. Pulse-rate obtained three times in each period; 



