142 



COMPARISONS OF RESPIRATORY EXCHANGE. 



preceded those with the Zuntz-Geppert apparatus, which may in part 

 account for the difference in the results. The value of 144 c.c. per 

 minute for the carbon-dioxide production for the period beginning at 

 ll h 20 m a. m. is probably incorrect, although there are no indications 

 that there was an error in the technique. The results with H. H. A. 

 show good agreement, with the exception of those obtained in the 

 first experiment, in which the values for the spirometer unit show a 

 markedly higher metabolism than those for the Zuntz-Geppert appa- 

 ratus. With P. F. J. the differences are both plus and minus. The 

 high average obtained for the oxygen consumption on February 5 with 



TABLE 20. Variations of average results obtained with the Zuntz-Geppert apparatus from those 

 obtained irith the Benedict respiration apparatus (spirometer unit). 



the Zuntz-Geppert apparatus is due, in part at least, to the high value 

 obtained in the last period. If this figure were excluded the results 

 obtained for the oxygen consumption with the Zuntz-Geppert apparatus 

 would be similar to those secured with the spirometer unit. The other 

 subjects also show both plus and minus variations, so that the results 

 obtained with both forms of apparatus are, on the average, comparable. 

 If the probability curves for the carbon-dioxide results are examined 

 (see fig. 42), it will be found that the total number of periods varying 

 1, 2, and 3 per cent from the average is practically the same with both 

 forms of apparatus. For instance, in 43 per cent of the periods, the 



