ii6 



IV. TIMBER. 

 This jnirt of the tree was not procurable for investigation. 



V. BARK. 



(fl) Economics (vide Chemistry). 

 (b) Anatomy. 



This bark is fairl}' even in structure, as will be seen by Eigure 62, which 

 is a transverse section through the entire breadth of a piece of the young cortex. 

 The cambium is at the bottom of the picture, and from this the bast fibres recede, 

 at first in regular concentric circles indicated by parallel, broken, dark lines in the 

 figure ; this regularity is, however, lost or broken amongst the outer cortex — 

 the top part of the section. Between these are three row's of vessels, the paren- 

 chymatous cells being between the sieve tubes, which latter or their sieve plates 

 can be seen in Eigure 64 b}^ the aid of a lens. A number of oleo-resin cavities 

 are scattered throughout the bark tissue, and on the outer portion are pale- 

 coloured bands of periderm, whilst Eigure 62 shows two of these in the upper part. 

 Figure 64 is a longitudinal section, the left being the inner bark, and the right 

 the outer bark . The long black lines in the left are the bast fibres, between which 

 can be seen the parenchymatous cells, and sieve tubes. 



(c) Chemistry. 



This sample of bark w-as forwarded to the JMuseum by IMr. Gill, the Con- 

 servator of Eorests for South AustraUa, and was collected in June, 1909. It was 

 from a tree 2 to 3 inches in diameter, so that the bark was somewhat thin, ranging 

 in thickness from 3 to 6 mm. It was dark grey externall\- and somewhat smooth, 

 although it was beginning to form furrows, and was somewhat fibrous. Although 

 the bark was so thin and fibrous, yet, it contained a fair amount of tannin, and the 

 red constituents of the bark had hardly commenced to form in this sample, con- 

 sequently the colour of the tanned hide powder was exceedingly light. The 

 chemical reactions given with the tannin were those for C. glauca, so that there 

 is little difference between the barks of these two species. 



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

 Moisture 10-84 per cent. 



Total extract 21-09 ,, 



Non-tannin 8-46 ,, 



Tannin 12-63 „ 



