H Doc 181 



Plate XXIII, 



r mr. 



mjz 



Radial Sections of Pinus i/eda and tangential Sections of Pinus palustris and echinata 



4 and 5, Pinus tjcda Radial sections, m 7 , medullaiy rays, tr , tracheids p paienchyma of the rays 9 p , simple pit 6p, bordered pit, c tr , 



common tracheids 

 C B tangential sections 



C, Pr\us palustris Lett hand pait in spnngwood light band poition m summers ood 



D~E, Pinus eohinata D, section m sptmgwood, a~c medullaiy i ays, a a small ray composed of tracheids only c a "tuple 11 ray, d, bordered pit 

 show mg the membrane in place E section in summei \\ ood a, bordered pit, other lettei s ab in A and B 

 Magnification of onginals, 5 ?\ ot illustrations A and #, 2 ?° C-i?, J i° 



