Journal Royal Society oftf.S. W., Vol. Ll, 1917. Plate XXXt 



y?«if^ 





Strychnos arborea. — Cross section, natural size, 

 are not pores but calcium oxalate cavities. 



The white markings 



Strychnos arborea. — Tangential section showing wood parenchyma 

 (white streaks) filled with calcium oxalate. 



