278 THE INCOME OF ENERGY 



together). Place the guinea-pig in the jar and 

 weigh. During one hour draw air through botr 

 ties 1 to 6 by placing an aspirator bottle on its 

 box and allowing the water to flow from this 

 bottle to the one remaining on the desk. The 

 rubber connecting tube must be changed wheiij 

 the aspirator bottles ; are changed. After -one- 

 hour weigh bottle 3, and bottles 4 and 5. 

 Tabulate results as follows : 



grams 



Weight of jar and guinea-pig at beginning 



' j --' " " " v end . . i 



Loss 



Wt. of bottle 3 (sulph. acid) at beginning 



" " end . . 



Gain (= water absorbed) ... . 

 Weight of bottles 4 and 5 at beginning . 



7"" " " end . . _^^__ 



Gain (= carbon dioxide absorbed) 



Total water and carbon dioxide absorbed 



Loss in weight of jar and guinea-pig . . 



i Difference (= oxygen absorbed) . 



Eespiratory quotient . . . . . . . 



METABOLISM 



Effect of Muscular Exercise on the Oxygen, Car- 

 bon Dioxide, and Water of the Respired Air. 



Kepeat the estimation of oxygen, carbon dioxide, 



