152 



ADVANCED LESSONS IN PRACTICAL PHYSIOLOGY 



cent, aqueous solution of KOH and 1 part of a 5 per cent, aqueous 

 solution of pyrogallic acid. The air must be analyzed as it passes into 



KOH Ba(OH), CaCk Animal CaCl* Cad* 



FIG. 93. APPARATUS FOR ESTIMATING THE CO2 AND H2O OF THE EXPIRED AIR. (Hall.) 



the apparatus represented in Fig. 93 and again as it leaves the siphon 

 bottle. To accomplish this end fill the gas buret A with water by 







Position 1. Position 2. Position 3 



FIG. 94. GAS BURETS FOR DETERMINATION OF OXYGEN. (Hall.) 



suction. Connect its upper end with tube K of the respiration appa- 

 ratus (Fig. 93), and allow the siphoned air to displace the water in the 



