244 SOME RECENT RESEARCHES IN PLANT PHYSIOLOGY 



F, used for the delivery of the plant sap to be investi- 

 gated. A stopcock, I, disconnects the two. G is another 

 burette used for 1 per cent, pyrogallol solution. By open- 

 ing the cock M this is allowed to flow into C, through L. 



FIG. 25. AIRTIGHT TITBATION VESSEL FOR USE WITH BUNZEL'S 

 OXIDASE APPARATUS. 



The basket H contains 1 c.c. normal sodium hydroxide 

 solution, and is suspended from K, the ground-glass stopper 

 which carries the burette. The edges of H are bent in- 

 wards to prevent splashing out of its alkaline contents, 

 and it is suspended at a sufficient height above C to insure 



