146 



(c) Chemistry. 



The bark of this species is, macroscopically, quite distinct from those of 

 C. calcarata and C. arciwsa. It is more fibrous, and in section does not show 

 the inner cortex so distinctly or so well defined as with those species. Externally, 

 the bark of C. glauca is grey, and often somewhat light in colour ; in section it 

 has a flesh tint well marked in the thicker barks. When taken from large trees 

 the bark is deeply furrowed, but has an interlocked hbrous appearance, which 

 cannot be mistaken for the liarder and more compact bark of C. calccwata. 



Three samples of the bark of this species were determined : — 



[ir Bark from small to medium size trees, collected at Narrandera, New 

 South Wales, March, 1909. Its total thickness was from 15 to 20 mm. 



The following results were obtained : — 



Moisture ... ... 11 -60 per cent. 



Total extract ... 20-85 >. 



Non-tannin ... 6-17 ,, 



Tannin ... ... 14-68 ,, 



(6) Bark from a large tree, i ft. 10 in. in diameter. The bark was very 

 thick, ranging up to 30 mm. (nearly 1^^ inches). It was somewhat fibrous and 

 deeply furrowed. It was collected at Narrandera, New South Wales, April, 

 1907. 



The following results were obtained : — 



Moisture ... ... ii-8o per cent. 



Total extract ... 19-72 ,, 



Non-tannin ... 5-12 ,, 



Tannin ... ... 14-60 ,, 



The same bark was extracted entirely with cold water, with eighteen hours 

 contact, and it then gave the following results : — 



Moisture ... ... 11-80 per cent. 



Total extract ... 12-70 ,, 



Non-tannin ... 2-45 ,, 



Tannin ... ... 10-25 ,, 



(c) Bark taken from a tree 5 to 6 inches in diameter. In thickness it 

 ranged up to 12 mm. .About half of this thickness consisted of the more com- 

 pact portion of the bark. It was collected at Narrabri, New Sdutli Wales, 

 June, 1909. 



