247 



The simple cells of the rays are comparatively large, as also are the 

 oblique perforations leading into the lumina of the tracheids. 



The pitted cells are numerous on the radial walls, and occasionally occur 

 in double rows — a rare occurrence in species of the Callitris genus. 



Vide Figures 165-6-7. 



V. BARK. 



(a) Economic {vide Chemistry). 



(b) Anatomy. 



The structure of this part of the tree conforms to the general rule of Callitris 

 barks fully described under C. glauca and other species. 



The most distinctive feature is, perhaps, the strongly-developed sieve tubes, 

 the plates being very numerous and clearly seen in a longitudinal section even 

 under the low magnification of Figure 168, whilst in Figure i6g, with a 350- 

 enlargement, they are very conspicuous objects. 



(c) Chemistry. 



This specimen of bark was taken from a log 12 inches in diameter, sent 

 from Tasmania. The bark was somewhat thin for a tree of this size, and it 

 does not seem to thicken to the extent shown in that of some species. The 

 total thickness was 7 to 10 mm. 



The colour externally was a dark grey to brown, somewhat deeply furrowed 

 and fibrous. It is a fair bark for tanning purposes, more especially for the 

 preparation of tanning extracts. 



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



Moisture ... 



13-6 per cent 



Total extract 



.. 22-8 



Non-tannin 



•• 5-4 



Tannin 



■ 17-35 „ 



