208 



Pennington — A Chemico-Physiological 



,0. J 



2.06 



Fe 2 s 



Na,0 32.15 



K 2 3-78 



C0 2 11. 10 



2.00 



32.00 



3-93 

 10.90 



Total 99-86 



99.69 



A glance at the recorded analyses of plant ash shows im- 

 mediately the great variation in their quantitative, though 

 not in their qualitative, composition. Not only do plants 

 of different genera vary largely, but those of different 

 species are quite as changeable. 



But few analyses of the ash of aquatic plants are to be 

 found in chemico-botanical literature, and these consist 



