igi 



One of the most important differential characters found in the various 

 mature sections examined, was the uniformly small number of single vertically 

 imposed cells of the medullary rays, as seen in a tangential section. The rays 

 are quite numerous and considerably more lengthened than in other species, 

 whilst every cell is filled with a brown substance, — the manganese compound. 



In Figure 126 these cells appear as thick black lines right through the 

 picture from top to bottom of the field. 



The cells of the tracheids containing the manganese compound, are fairly 

 distributed throughout the xylem, but favour perhaps the locality of the 

 autumnal growth. FigTire 126 shows a few of these cells. 



The pitted cells are all disposed on the radial walls of the tracheids. They 

 are faintly shown in section in Figure 127, a tangential section of the timber. 



The perforations are circular and single in each lumen. 



V. BARK. 



(a) Economic (see ■ Chemistry). 



Chemistry. 



The bark of this species is somewhat hard and compact. Externally it 

 is of a dark grey to brown colour and deeply furrowed. The specimen determined 

 was from 10 to 12 mm. in thickness. The colour of the powdered bark was darker 

 than that of any of the other species, and the extract was very dark coloured 

 also. Although this shows a defect for tanning purposes, yet, this may not be 

 characteristic of this bark always, as the specimen had been in the Museum for a 

 considerable time. 



The following results were obtained with the air-dried bark : — 



Moisture ... 



9-94 per cent. 



Total extract 



.. 20-o8 „ 



Non-tannin 



•• 7-79 



Tannin 



.. 12-29 



EXPLANATION OF PLA-IE (Page i86). 



Fig. I. — Twig with branchlets and male amenta. Fig. 5 — Cones unexpanded (natural size). 



*Fig. 2. — Individual branchlets. Fig. 6. — Cones expanded. 



*Fig. 3. — Male amentum. Fig. 7. — Seeds (natural size). 

 *Fig. 4. — Stamen with anthers. 



* Enlarged. 



