368 Jeffrey and Cole. — Investigations on the Genus Drimys. 
Fig. 7. Longitudinal radial section of wood of injured root of D. colorata. To the left tracheides 
occluded with gummy matter resulting from injury. To the right more or less vessel-like tracheary 
elements, x 75. 
Fig. 8. Another longitudinal radial section of injured wood of root of D. colorata , showing 
wood parenchyma, tracheides, and one clearly vessel-like element, x 125. 
Fig. 9. Still another longitudinal radial section of the same, showing a variety of vessel-like 
structures formed as a consequence of injury, x 125. 
Fig. 10. Longitudinal radial section of the wood of the root of Liriodendron tulipifera . In 
the centre is seen a vessel of rudimentary type indicating clearly the origin of perforations from 
modified pits. x 75- 
Fig. 11. Radial section of root of L. tulipifera , showing vessel in the centre. The lateral 
pits of the vessel are scalariform, and the perforations originate from the loss of border and membrane 
in certain of these, x 125. 
Fig. 12. Transverse section of portion of a three-year-old twig of Alnus japonica , showing the 
disappearance of vessels in the segment of the woody cylinder corresponding to a leaf trace, x 20. 
