no 



THE STORY OF THE EARTH. 



grows erect, and never reaches a height of 

 more than a foot or two, is represented by forest 

 trees, which grew to a height of fifty to seventy 



I 



Part of the trunk of a Sigfllaria from the coal near Hud- 

 field, ihowing the thin outer carbonaceous layer with leaf- 



Like the conifers they have become known 



h part of the tree- received a 

 distinct name, before the structure was known 

 fully. I tria the trunk is vertically grooved, 



with the leal b< ars extending round it in a sp 



In / ( . n . 



in a lozenge-shaped area, and sin- 



