THE ENERGETICS OF PHOTOSYNTHESIS 



39 



holding the cell suspension at one arm only, whereas the other arm is left open 

 to the atmosphere. In the differential manometer the assimilation vessel 

 contains the cell suspension and the compensation vessel contains the same 

 salt solution but without any cells. 



t^l- 



Fig. 18. Manometer vessels. 



To stopcock 



Capillary tube 



For changing 



culture chemically 



(by tipping vessel and 



manometer intact) 



Fig. 19. Scheme of typical Warburg manometer (Burk and Hobby, Science). 



