ZUNTZ-GEPPERT AND BENEDICT METHODS. 



141 



TABLE 19. Respiratory exchange in comparison experiments with the Zuntz-Geppert apparatus 

 and the Benedict respiration apparatus (spirometer unit). (Without food.) Continued. 



Subject had light breakfast at about 7 a. m. 



The differences in the individual experiments are given in table 20, 

 the values for the spirometer unit being used for the base-line. If 

 these differences are considered, it will be found that on the whole the 

 variations between the two apparatus are not very large. The 

 greatest differences are found with the subject H. F. T., who was an 

 extremely difficult subject to work with, as, without consciousness on his 

 part, his respiration showed frequent periods of apncea. It will be 

 seen that in nearly all of the experiments with this subject, the carbon- 

 dioxide production with the Zuntz-Geppert apparatus is lower than 

 with the spirometer unit and that there is a somewhat marked differ- 

 ence in the respiratory quotient. There is likewise a large difference 

 in the volume per respiration, this volume being much smaller with the 

 Zuntz-Geppert apparatus than with the spirometer unit. The subject 

 K. H. A. shows a somewhat wide variation on February 2. In the 

 experiment on this date, all of the periods with the spirometer unit 



