North American Salic ales. 
173 
Fig. 7. Same, x 400. 
Fig. 8. Same, x 700. 
Fig. 9. Same : tangential section of stem, showing multiseriate rays under leaf-trace, x 300. 
Fig. 10. Same : tangential section of root, showing multiseriate rays under root-trace, x 300. 
Fig. 11. P. balsamifera : transverse section of traumatic wood, showing biseriate rays, x 300. 
Fig. 12. Same : tangential section of traumatic wood, showing biseriate rays, x 300. 
PLATE XXI. 
Fig. 13. P. Fremontii : tangential section of normal wood, showing biseriate rays, x 300. 
Fig. 14. Salix Nuttallii : transverse section of normal wood, showing uniseriate rays and terminal 
parenchyma, x 300. 
Fig. 15. Same : tangential section of normal wood, showing uniseriate rays, x 300. 
Fig. 16. Same : radial section, x 300. 
Fig. 17. Same : radial section, showing marginal ray cells, x 300. 
Fig. 18. Salix sp. : tangential section of stem, showing multiseriate rays under leaf-trace, 
x 300. 
Fig. 19. Same : tangential section of root, showing multiseriate rays under root-trace. X 300. 
Fig. 20. S. nigricans \2x.primulif0lia : transverse section of traumatic wood, showing vasicentric 
parenchyma, x 300. 
Fig. 21. Same, x 400. 
Fig. 22. Same, x 700. 
Fig. 23. A. Huviatilis : transverse section of normal wood, showing vasicentric parenchyma, 
x 300. 
Fig. 24. S. laevigata : tangential section of normal wood, showing biseriate rays, x 300. 
