PLATE LV 



Fig. i. Cross section of a diffuse porous wood, yellow poplar or tulip, showing 

 scattered tyloses X 50. T, tylose-filled vessels; V, empty vessels. 



Fig. 2. Ooss section of a ring porous wood, osage orange, with vasicentric paren- 

 chyma, showing abundantly developed tyloses (T) X 50. 



