ALUMINA IN PLANTS. 61 



in which it occurs in all fertile soils, is not soluble in pure 

 water, or water containing carbonic acid ; and that it 

 cannot be detected in any other plant growing on the 

 same soil by the side of the club-moss. In like manner, 

 Schultz-Fleeth could not discover in the water in which 

 Arundo phragmites (one of the plants most abounding in 

 siHcic acid) was growing, sufficient silicic acid to yield a 

 ponderable amount in the composition of 1000 parts of 

 the water. 



