AS COMPARED WITH THAT OF THE PRESENT DAY. 



425 



we only portions of branches, &c, such as we possess of Lepidodendron, 

 it were impossible to recognize the plant. At letter a is shown the 

 base of the stem, covered with closely imbricating leaves ; at letter b, a 

 portion from the middle, with very long tapering appressed leaves ; at 

 letter c, the branch, with its elongated spreading and squarrose foliage. 



Fig. 13. 



W^ 



1/ 



The third modification of this plant is represented at (Fig. 14), in which 

 the branches are uniformly slender, and clothed with similar appressed 

 leaves throughout ; but the arrangement of these leaves is exceedingly 

 variable ; for at letter a they are closely imbricated and cover all the 



