PLATK. u. PSEUDOTSUGA MIOCENA. Radial section showing the effects of decay 

 in breaking up the substance of the cell wall along the lines of striation. 

 X 127.8 



PI.ATK [2. CORDAITES MATERIARIUM. Transverse section showing the absence 

 of growth rings, the character of the trachricls, and the distribution of resinous 

 tracheids near the medullary rays, x 40.9 



