70 ROYAL SOCIETY OF CANADA 



EXPLANATION OP ILLUSTRATIONS. 



1. Taxodium distkhum. Transverse section, x 46. 

 iSequoia langsdorfii, 



2. Transverse section, x 52. 



3. Radial section, x 52. 



4. Tangential section, x 52. 

 Sequoia burgessii. 



5. Transverse section, x 46. 



6. Radial section, x 52. 



7. Radial section sliowing large thyloses in the resin canal of a fusiform 



ray. x 180. 



8. Tangential section showing uniseriate rays, and large fusiform rays 



with resin canals filled with thyloses. x 52. 

 Cuprcssoxylon dawsoni. 



9. Transverse section showing characteristic features of structure, x 52. 



10. Radial section showing bordered pits in two rows, x 180. 



11. Tangential section showing characteristic, uniseriate rays, x 52. 

 Pseudotsuga miocena. 



12. Transverse section showing structure comparable with the fine grained 



" yellow fir." x 46. 



13. Tangential section showing characteristic fusiform rays, x 150. 

 Rhavmacinium porcvpittianum. 



14. Transverse section showing characteristic features of structure, x 52. 



15. Radial section showing the high and numerous rays, x 52. 



16. Tangential section showing the fusiform, multiseriate rays, x 52. 

 Rhamnaciniutn triseriatim. 



17. Transverse section showing the more numerous vessels of a more 



simple character than in R. porcupinianum. x 46. 



18. Radial section showing the two kinds of cells and their distribution. 



X 46. 



19. Tangential view of a ray through a uniseriate portion, interposed be- 



tween multiseriate regions, x 200. 



20. Tangential view of a triseriate ray of the more simple and more com- 



mon form. X 200. 



Rhamnacinium porcvpinianum. 



21. Radial section of a ray, showing in part, the different character of the 



cells and the perforations of the lateral walls, x 200. 



22. Tangential section of a ray showing contact of the uniseriate and 



multiseriate regions, x 200. 

 Sequoia sempervirens. 



23. Transverse section showing nature and distribution of resin passages. 



X 55. 



