44 
president’s ADDRESS — SECTION 33. 
Queensland, # finding arabin in A. Cunninghamii. Heckel subse- 
quentlyf gave analyses showing arabin to occur in three additional 
Araucaria exudations (making four in which he found it). He later 
on found arabin in the Chilian A. imbricata , Pavon ; and it was 
reading an account, in a Chilian scientific journal, J of this research 
that first made me aware of Professor Heckel’s work on Araucaria 
gum-resins. His courteous reply to my request for information has 
enabled me to present my hearers with this account of what has 
been done in regard to the investigation of these very interesting 
substances. 
Dr. T. E. de Vrij collected in Java from Podocarpus cupressina 
a resin which, on treatment with alcohol, yields a white crystalline 
acid substance. Oudemans§ has worked at this acid, and describes 
some of its salts and derivatives. We have four species of Podocarpus 
(JSfageia ) , and one at least (P. data^H. Br.) might be expected to yield 
resin. The others are shrubs ; and if they yield it at all, it w ould only 
be in very small quantity. I have never heard of a resin having been 
found on an Australian Podocarpus , but would suggest that it be 
carefully looked for, and examined for podoearpic acid and other 
bodies. 
Through the courtesy of Mr. E. M. Bailey I was enabled to 
examine an oleo-resin from a new Queensland species of Canarium 
(O. Muelleri, Bail.). The substance is the more interesting for the 
reason that Manilla elemi is supposed by some to be the product of 
C. commune , Linn., but the Queensland exudation proves to be simply 
a solution of a resin in a volatile oil, and to be free from amyrin. 
No doubt a number of interesting resins and gum-resins will be 
found in the Butaeeae. 1 have gum-resins (?) from Evodia accedens , 
Blmne, and Medicosma Cunningham ii, Hook, f., which must wait their 
turn for examination. 
My research on the Piftosporum exudations || will be amplified as 
soon as 1 get additional material. The exudations of other species 
require to be carefully examined, and the true gum stated to be found 
on P. phillgrceoides, DC., should not he omitted. 
tc Erom wounds in the bark of A Han thus imberbifolia, F. v. M. 
(Simarubeas), a resinous substance exudss, which burns with a 
brilliant flame” — (Thozet).^f I am not aware that this substance has 
ever been examined ; it would probably prove interesting. 
A sticky aromatic resin exudes from Bed Cedar ( Cedrela 
australis , E. v. M.) when enclosed, on keeping. We know nothing of 
its composition ; neither do we know' anything about the resinous 
exudations found on the foliage of Owmias , Elimtersius , &c., which 
are sometimes of an alliaceous odour. Has anyone examined the 
exudation which is similarly found on Dodoncca viscosa , Linn. 
(Sapindacese) ? 
*Proc. R.S. Qd., vi. (16th August, 1889). 
t Revue des Sciences naturelles appliquees, No. 16, p. 14 (20th August, 1891). 
t Prdces-Verbaux n of the Actes de la Societe Scientifique du Chili, tome ii., 
lere Li v raison (1892). [Sesion jeneral del 4de Abril, de 1892.] 
§ Journ. f. prakt. Chimie, quoted in Journ. Soc. Arts, xxii., 864 ; Watts’ Diet., 
viii. [2], 1657. 
|| Proc. A.A.A.S.,iv. 
Ii Rep. Intercol. Exh. Melb., 1866-7, 232. 
