ANATOMY AND PHYLOGENY UF THE CONIFERALES. 459 



Fig. 22. TraiLsverse section through the central portion of a wounded root of Abies balsamea, showing the presence of 

 a tangential row of traumatic resin ducts, x 32. 



Fig. 23. Transverse section through a leaf trace of a vigorous leaf of a mature tree of ,S. gigantea. X 200. 



Fig. 24. Transverse section of the wood of 8. .sc);ipen)(>f)i.s, showing the preseuce of a tangential row of resin ducts. 

 X 35. 



PLATE 71. 



Fig. 25. Part of the last section more highly magnified, showing the structure of the wood and the resin ducts. 

 X 100. 



Fig. 26. Transverse section of a young branch from an immature tree of S. sempervirens. X 30. 



Fig. 27. Transverse section of part of an injured stem of S. sempervirens, showing the presence of tangential rows of 

 traumatic resin ducts in the autumnal wood. X 50. 



Fig. 28. Transvei'se section of another similar .specimen, .showing details of the structure of the traumatic resin ducts. 

 X 200. 



Fig. 29. Transverse section through the woody axis of the cone of 6'. semperviretis. X 35. 



Fig. 30. Transverse section through the woody portion of the base of the cone scale of the same .species. X 50. 



Fig. 31. Transverse section through the upper portion of the cone scale of S. sempervirens. X 40. 



Fig. 32. Transverse section through the root of S. gigantea. X 4(1. 



Printed, November, 190°i. 



