RESPIRATION 



117 



ally in a chart. Another opportunity will be used for giving the 

 methods used in the graphic representation of statistical tables. 



The table which results from the data collected in connection with 

 the previous lesson is not so large but that the observer can practi- 

 cally comprehend the whole at a glance. 



Our grouping enables us to answer the following questions: 



1. Has general physical activity any essential influence in the 

 development of the respiratory organs and function? 



2. Is the climbing of hills in early life a factor in the development 

 of the respiratory organs and function? 



If both of these questions may be answered affirmatively, then 

 one would expect to find that the median values of Group I. (active 

 individuals from a hilly country) uniformly exceed the values of 

 Group II., and that those of Group III. uniformly exceed those of 

 Group IV., but that the median lines of Group II. may or may not 

 exceed those of Group III. 



VI. QUANTITATIVE DETERMINATION OF THE C0 2 AND H 2 

 ELIMINATED FROM AN ANIMAL'S LUNGS IN 

 A GIVEN TIME. 



1. Appliances. A 4-ounce Woulffe bottle with three necks and 

 with delivery tubes and stopper ground in the necks (Fig. 62, a); 



Fia. 62 



Apparatus for the estimation of CO2 and H^O in exhaled air. 



three 5-inch calcium chloride tubes, with side tubes and perforated 

 glass stoppers, opening and closing the flow of gas (Fig. 62, c, e, /); 



