THE KOOT. 37 



plants have become truly parasitic, the habit, as it occurs 

 in the vegetable kingdom, being chiefly characteristic of 

 fungi. , N 



In their microscopic structure roots exhibit essentially 

 the same tissues and elements as are found in the stem, 

 which we shall soon study in detail. There are, Minute anat- 

 to be sure, certain differences of arrangement, ""y' 

 already mentioned in connection with the mechanical func- 

 tion of roots, that cannot here be discussed at length. 

 Those who wish to make a thorough study of the minute 

 anatomy of roots will find the necessary assistance in such 

 works as Strasburger's Practical Botany and De Bary's 

 Comparative Anatomy of the Phanerogams and Ferns. 



