PLATE 15. DAMMARA AUSTRALIS. Tangential section showing the character of 

 the medullary rays and the occurrence and location of plates of resin. X 52 



PLATE 16. ARAUCARIA GLAUCA. Transverse section showing the general char- 

 acter of the structure, the absence of growth rings, and the distribution of 

 resinous tracheids. X 46.8 



