NO. l6 CARBON DIOXIDE ASSIMILATION HOOVER ET AL. 7 



of the next drop at C. The air to l^e analyzed enters through the 

 tube, N, and is brought to the temperature of the bath before entering 

 the bulb, B, by passing through the coil, O. Since only a small portion 

 of the air is used for analysis the excess escapes through the side 



Fig. 2. — Diagram of apparatus for carbon dioxide determination. 



tube, P. After the air and KOH solution have been brought together 

 in definite proportion by volume they traverse the coiled tube, F, suf- 

 ficiently long to insure practically complete absorption of the carbon 

 dioxide. They are separated at the bottom end of the coil, F, w^hich is 

 widened at this point to disrupt the liquid film, the liquid flowing into 

 the cell, HGK, and the air escaping through the tube. The over- 

 flow from the cell passes out through the siphon, L, the outer portion 



