179 



The simple pits vary from two to five in each lumen of the section and have 

 oblique perforations, which are seen in Figures ii6 and 117, at the bottom of 

 both plates. The bordered pits are a conspicuous object on the radial walls, 

 and exceptionally show a likeness in disposition to those of the Araucarias, being 

 sometimes found in double rows. 



In Figure iii the autumnal wood running from left to right just above 

 the middle of the picture, is marked by the cells having restricted lumina. The 

 two dark lines on the right and left of the plate locate the medullary rays, and 

 the dark spots the manganese compound content of a few of the tracheids. 

 Figure 112 takes in a much larger field in a transverse section, the black lines 

 marking the medullary rays. Figure 113 is a tangential section showing the 

 fusiform shape of the rays, cut end-on, which are well outlined owing to the dark 

 contents of the cells. Figure 114 is a similar section to Figure 113, but 

 produced to show the extraordinary height of some of the rays, and it also shows 

 the bordered pits in section on the radial walls. Figure 115 is a larger magnifica- 

 tion of Figure 114, but is specially interesting, as it shows bordered pits on the 

 tangential walls, a very rare feature in CaUitris; sections of bordered pits on the 

 radial walls are seen towards the left. 



(c) Chemistry. 

 (See articles on the Phenol and the occurrence of Guaiol.) 



V. BARK. 



(fl) Economic {vide Chemistry). 

 (6) Anatomy. 



The parenchymatous cells are particularly well developed in this bark, and 

 can be well seen in Figures 118, iig, 120. In Figure 118 they are the distinctly 

 marked, empty spaces between the regular rows of bast fibres, in which Figure 

 are also well defined the medullary rays running from top to bottom of the plate ; 

 whilst the larger empty spaces are the oleo-resin cavities, one of which occurs 

 in the centre of Figure iig, where also are numerous parenchymatous cells filled 

 with the manganese compound. Figure 120 is given in order to show what a 

 great proportion of the bark substance is composed of sieve tubes and paren- 

 chymatous cells (top half of picture) in comparison to that of the bast fibres, — 

 which can just be detected as small rectangular bodies, \\ith a line in the centre 

 indicating the locality of the central channel. In the middle of Figure 120 is 

 a band of periderm running through the centre of the picture from left to right, 

 and below this towards the bottom of the plate are three large empty oleo-resin 

 cavities. Sieve tubes, although very numerous, are exceedingly small in this 

 bark^ 



