318 RESULTS. [APP. I 



The results of these three experiments should not differ by 

 more than 1 2p.c. 



Experiment No. II. 



Values obtained in three different sets of experiments. 



Leaves killed in the Leaves killed iu the 



evening. early morning. 



Starch 3-4 2-5 p.c. 



4-8 1-7 p.c. 



4-0 3-2 p.c. 



As the figures indicate the result of these experiments 

 varies greatly, and apparently in no regular way, but the 

 greatest difference may be expected when a warm damp night 

 has succeeded a clear bright day. 



Experiment No. III. 



Seedlings kept in dark 

 Grains. for three days. 



Starch 59'6 3'Op.c. 



CHAPTER XV. p. 301. Organic acids, etc. 



Qualitative. 



For ascertaining what organic acids are present, free and 

 combined, beet- root juice may be examined, in which varying 

 quantities of acetic, glycolic, malic, citric, tartaric, oxalic, 

 succinic, and aconitic acids are commonly present. 



Quantitative. 



Values for old and young petioles of rhubarb. 



Experiment No. 1. 



Young Old 



Acidity. petioles. petioles. 



[Calculated as oxalic acid O6 2-2 p.c. 



H 2 CA.] 



