I 



Apr. 1894.] BOTANICAL SOCIETY OF EDINBURGH. 199 



tube. The gas, which consists of carbonic anhydride, 

 with a slight admixture of air, was analysed in the usual 

 way in a Frankland's gas apparatus. A deduction was 

 made from the quantity of carbonic anhydride found, to 

 allow for that which was originally present in the potassa 

 solution employed. The quantity of carbonic anhydride 

 found, subtracted from the total quantity of oxygen 

 absorbed during an experiment, gave the amount of 

 oxygen absorbed and retained by the seeds. 



These experiments were conducted at intervals during 

 1883, 1884, and 1885. Three blank experiments were 

 tried with the apparatus placed in a dark room, and fitted 

 up as described. The results thus obtained are tabulated 

 on the next page. 



