ON THE PINES OF AUSTRALIA. 133 
Fig. 14.—Longitudinal section through a node showing an oil 
cell 2m sitwin the concrescence and part of the free portion. x 55. 
Fig. 15.—Longitudinal section through node showing position 
of stomata on the ventral surface, x 75. 
Fig. 16.—Transverse section of timber showing two annual 
rings. x 50, 
Figs. 17 and 18.—Transverse section of timber showing arrested 
growth of autumnal tracheids and resin scattered throughout the 
Summer and spring tracheids. The dark lines are the resin (sic) 
in the vessels of the medullary rays. x 80. 
Fig. 19.—Transverse section of spring tracheids showing pitted 
cells (in section) on radial walls. x 210. 
Figs. 20 to 23.—Radial section of timber showing medullary 
rays with both inner and outer vessels filled with resin, and their 
single cells. Pitted cells are distinctly shown as well as resin in 
the tracheids. x 80. 
Fig. 24.—Pitted cells in situ on radial walls. x 160. 
Fig. 25 and 26.—Tangential section giving end-on view of 
medullary rays, which shows their fusiform outline and the resin 
content of inner and outer cells. Pitted cells of the radial walls 
are seen to be numerous, their varying shapes being close to the 
angle of section. An occasional pitted cell will be seen to occur 
on the tangential walls. (25) x 80, (26) x 160. 
Figs. 27 and 28.—Longitudinal sections of bark to show that 
the resin vessels are not canals. x 43. 
Fig. 29.—Portion of inner and outer transverse section of bark, 
the large oval spaces are the oleo resin cavities. x 80. 
Fig. 30.—Transverse section of a portion of outer bark. The 
dark patches are tannin sacs. x 80. 
We wish to express our thanks to Professor H. OC. Jefirey, 
Harvard University, for some of the sections of timber and 
bark, and to Mr. F. H. Taylor, of this Museum, for the 
remainder of the sections. 
