38 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [NoV, 2, 



Pi g. 17 . — Structure ofArtisia ; South Fig. 1 8 . — Structure of coniferous 7 wood, 



Joggins. magnified ; from the interior of an 



erect tree in Group XV. (see p. 20). 





b. Transverse 

 section. 



«. Longitudinal 

 section. 



Fig. 19. — Structure of the wood of an 

 erect coniferous ? tree ; South Jog- 

 gins. 





a. Cast of the pith-cavity : nat. size. 



b. Transverse section of the wood : magnified. Transverse section. 



Fig. 20. — Structure of the wood of a tree-stump, 

 magnified ; South Joggins. 





WB^i 





'm 



a. Transverse section. b. Longitudinal section. 



Fig, 21 a. 



Fig. 21 b. 



% 



ci5' 



Fig. 21 c. JS 

 1 



^ 



'^ 



S. 



Longitudinal sections ; magnified. b. Transverse section, with supposed lines of 



growth ; nat. size. c. Transverse section ; magnified. 



