I/O 



texture and appearance, from the more interlocked and fibrous bark of C. glauca. 

 In the green state it differed from C . calcarata by showing a more red, ahnost 

 crimson layer where the outer portion is separated from the inner or more compact 

 bark. The red colour of this layer faded as the bark dried, and did not appear to 

 be at ah objectionable. 



Externall}-, the bark was of a dark dirty-brown colour, somewhat blackish 

 in places, and seldom grey. It was deeply furrowed. The total thickness was 

 20 to 30 nun. ^almost i\ inchesX The portion without the corky layer was 7 to 

 8 mm. The air-dried bark powdered fairly well, giving a light-coloured powder. 

 The tannin content was very considerable for barks belonging to the Coniferse, 

 and compares very favourably in this respect with most tan-barks. The greater 

 portion of the tannin was readily extracted with cold water, and the amount of 

 non-tannin in the extract was found to be very small indeed. Three analyses 

 were made with the bark, in all cases air-dried: — 



(a) A fair section through the whole bark, 



(b) The " rossed " bark in which the outer cortex was removed, until 

 practically a smooth surface had been obtained, and 



(c) A determination of the tannin in the "rossed" bark, extracted 

 entirely by cold water after eighteen hours' contact. 



The following results were obtained with the whole bark : — 

 Moisture ... ... 13-3 per cent. 



Total extract ... 29-3 „ 

 Non-tannin ... 4-2 ,, 



Tannin ... ... 25-1 ,, 



The results witli the inner " rossed " bark were: — 





.Moisture ... 



... 13-50 per cent. 





Total extract 



... 40-14 





Xon-tannin 



••■ 5-37 





Tannin 



•-- 34-77 





The results with the inner " 



rossed" bark by cold-water extraction alone 



were: 



— 







Moisture ... 



... 13-50 per cent. 





Total extract 



••• 3174 





Non-tannin 



••• 3-24 





Tannin 



... 28-50 



Altiiough the bark was so rich in tannin, yet, the extract (25 grams i)er 

 litre) became but little turbid when cold, and the liquor obtained by the cold 

 extraction was excellent m this respect. See also article, "The Tanning Value 

 of Callitris Barks." 



