THE ELEMENTS 



OF 



STRUCTURAL BOTANY. 



NOTE. 



The attention of the student is directed to the 

 following oversights in revision : 



In 277, insert "partly" before "because." The 

 undissolved portion of the grain obviously contains 

 other matter besides starch-cellulose. 



In 307, the statement that carbonic acid gas may 

 be absorbed in solution by roots (given in the first 

 edition on the authority of Oliver) requires modifi- 

 cation. It seems to be now well established that the 

 gas is absorbed directly by the leaves, and not by the 

 roots. 



(JL 



observation. 



