Dec. 1893.] BOTANICAL SOCIETY OF EDINBURGH. 



31 



flask, aud the quantity of nitrogen again determined. In 



calculating the volume 

 of the confined air, the 

 usual corrections were 

 applied for temperature, 

 pressure, and tension of 

 aqueous vapour. 



By the above means, 

 we have the data neces- 

 sary for ascertaining the 

 quantity of atmospheric 

 nitrogen present in the 

 rjerminatinfT flask at the 

 commencement and end of each experiment. I give below 

 the results obtained in the series of six experiments. 



EXPERIMENT 1.-2,269 Grammes Steeped Barley. 

 Temperature during Growth, 15-5° to 19-0° C. 



Composition of the Air in the Flask. 



At start of Experiment. At end of Experiment. 



Oxygen 20-77% 6 29% 



Nitrogen 79-23% 80-16% 



Carbonic Anhydride 0'00% 13-55% 



100-00 



100-00 



Volume of Air — 



At start of Experiment 

 At end of Experiment, 



c.c, % c.c. 



..99-08, containing 79-23 Nitrogen = 78 -50 



..OS-Ol, ,, 80-16 ,, =78-56 



Gain= 0-06 



EXPERIMENT 2.-2,305 Grammes Steeped Barley. 

 Temperature during Growth, 20 ^^ to 23-0' C. 



