72 



COMPARISONS OF RESPIRATORY EXCHANGE. 



be introduced through the leveling bulb and tube M and rubber tubing 

 N. Haldane recommends that the extra bulbs on the oxygen pipette 

 be filled with potassium pyrogallate, as this protects the pyrogallate 

 in the pipette. The stopcock F can be turned so that the gas from the 



FIG. 32. Haldane gas-analysis apparatus (laboratory form). 



A, "^burette \\B, water jacket; C, three-way stopcock; D, leveling bulb, connecting with burette 

 A; E, potash pipette; F and G, right-angle stopcocks; H, tee connecting E with leveling bulb / 

 and three-way stopcock, J; K, compensating tube; L, potassium pyrogallate pipette; M, N, bulb 

 and tubing for introducing potassium pyrogallate into L; O, P, arrangement for fine adjustment of 

 mercury level in A; Q, stopcock; R, combustion pipette containing stick yellow phosphorus; 

 S, leveling bulb; T, tube for forcing air into water-bath. 



