Scholander Gamma-Burette 



This instrument 13 (fig. Al), so named because the 

 smallest division on the micrometer approximates a volume 

 of one y-liter (= 0. 001 mg of water) or slightly less, analyzes 

 minute quantities of gas by differential chemical absorption 

 to an accuracy of ±2 to 3 x 10" 4 mm 3 . 



Samples of the gases contained within the pneumato- 

 phores of N. bijuga were invariably analyzed by use of this 

 instrument. The precision of duplicate or triplicate analyses 

 performed with care will generally lie within a range of 0. 3 

 to 0. 7 percent by volume for a given gas. 



Figure Al. Scholander gamma-burette micro gas analyzer; the gas bubble is partially ex- 

 truded from the glass burette tip into each successive liquid absorbent. The micrometer 

 may be read to ±2 to 3 x 10— i mm 3 by use of a hand lens. 



38 



