OCCURRENCE OF CALCIUM OXALATE IN EUCALYPTUS BARKS. 31 



8*34, E. occiclentalis 6*82, E. viridis 5*01, E. redunca 4*46, 

 E. polybractea 2*14, E. stricta 0*69, E. Morrisi 0*08. 



The total amount of ash in the barks does not always 

 correspond to the calcium oxalate present ; for instance in 

 E salubris the total ash was 18'59°/°; in E. gracilis it was 

 only 13 # 98 / , of which amount 11*41°/" represents the calcium 

 oxalate. 



The general appearance and thickness of the several 

 barks tested were as follows : — 



Eucalyptus gracilis — a thin, mostly smooth bark, light 

 in colour and not fibrous. Thickness 2 to 3 millimetres. 



Eucalyptus Behriana — a very thin, smooth bark, light 

 in colour, easily powdered and not fibrous. Average thick- 

 ness 2 mm. 



Euccdyptus salubris — a hard, thin, close, brittle bark, 

 brownish to grey externally. Thickness 2 to 5 mm., but 

 rarely more than 3 mm. 



Eucalyptus oleosa — a somewhat thin and fibrous bark, 

 separating in layers and of a light brown colour. Thickness 

 from 3 to 5 mm. 



Eucalyptus dumosa — a very thin, smooth bark, of a 

 brownish to grey colour, powders easily. Thickness about 

 2 mm. 



Eucalyptus salmon ophloia — a thick, smooth bark, salmon 

 to grey externally, somewhat hard and compact, but inclined 

 to be fibrous, powders fairly well. Thickness from 7 mm. to 

 1 centimetre. 



Eucalyptus occidentalis — a fairly light coloured bark 

 and having layers of kino in the thicker portions, powders 

 readily. Thickness from 5 mm. to 1 cm. (This bai k also 

 occurs much thinner, 2 to 4 mm.) 



Eucalyptus viridis — a hard, compact bark but interlocked 

 and fibrous ; it was taken from a large tree. Externally 



