(c^ Chemistry. 

 This sample of bark was collected at ;\iur\villuinbali, New South Wales, 

 ill Xovember, 1907. It was an average sample of the bark of this tree, and a fair 

 section through the outer and inner bark was takt'u for analysis. The outer layer 

 of bark encircling the tree, which, separatin;; in hoop-like forms, gives the 

 name " Hoop Pine " to this tree, was 2 to 3 mm. thick, hard and compact, and 

 red in colour ; it was greyish externally and somewhat rough ; the furrows, which 

 are not deep, have the peculiarity of running around the tree instead of vertically. 

 The inner layer is about 10 mm. in thickness, is somewhat soft, porous, and fibrous, 

 the fibres running longitudinallv. The bark powdered fairly well, but the extract 

 was dark coloured, ]ioor in tannin, and would make a dark-coloured leather. It 

 acts only fairly well on hide powder, staining it brownish in colour. The results 

 show it to be of little \alue as a tan bark. The non-tannin extract contained 

 some gum. 



The following results were obtained on analysis : — 



Moisture 12-60 per cent. 



Total extract ... 12-24 >. 

 Non-tannin ... 7-24 ,, 



Tannin ... ... 5-00 ,, 



The aqueous extract gave a green colour with ferric salts, and the other general 

 reactions were also those for a catechol tannin. 



CHEMISTRY OF THE LATEX. 



Theoretical. 



The fresh latex was obtained from the trees of this species so that its con- 

 stituents might be compared with the gum-resins exuded by other species of this 

 genus. 



The exudations of the Araucarias were shown by Heckel and Schlagden- 

 hauffen in 1887 cCompt. rend., 105, 359) to contain both gum and resin, and the 

 exudation of A. Ciinnin^hamii has long been known to contain a gum as well as a 

 resin 'see paper by Maiden, " Proc. Roy. Soc," Queensland, Vol. VII, 1890, also 

 paper by Dr. Lauterer, " Botany Bulletin," No. XIII, Queensland). As no other 

 data were available in reference to the exudation of .1 . Cimninghamii, it was thought 

 desirable to undertake as complete an investigation as possible of the latex of the 

 plant, in preference to that of the solidified gum-resin, which is found at times 

 occurring in some cjuantity on the exterior f)f the tree. .Attempts were made 

 to draw the latex from the living trees, and those growing in Northern New South 

 Wales were utilised for the i)urj)ose ; j^oor results were obtained in this way, 

 although a little gum-resin had accumulated ;il llir iiijund places after a week, 

 yet, the amount was very small during that time. Better results were, however, 



