22 THE GEOLOGICAL HISTORY OF PLANTS. 



fruits, in the Denbighshire grits, at the base of the Si- 

 lurian.* 



Fig. 2. — JVematophyton Logani (magnified). Vertical section. 



From comparison of this singular wood, the structure 

 of which is represented in Figs. 2, 3, 4, with the debris 



Fig. 3. — JVematophyton Logani (magnified). Horizontal section, showing 

 part of one of the radial spaces, with tubes passing into it. 



of fossil taxine woods, mineralised after long maceration 

 in water, I was inclined to regard Prototaxites, or, as I 



* "Journal of the Geological Society," August, 1881. 



