﻿178 Cincinnati Society of Natural History. 



Figure i.— Ideal Section of Lepidodendron.— After Joseph LeCon 



In a drawing of the same kind of tree by J. D. Dana, the phyllotaxy is 

 beautifully shown (in the Halonia pulchella). The helix ascending 



Figure 2,-Cham/erops Palmetto. --J. W. A. 



The ascending helix of leaf growth makes an angle of 70° with the axis of the trunk, 

 The transverse helix makes an angle of 37 . 



