i : 41 
These reactions indicate the identity of Hibiscus gum with gum 
tragacanth, and its total discrepancy from the gum of the Sterculias, 
i mon product of retrograde metamorphosis 
ot 
Ss 
BS 
~ 
ie 
a 
+ 
ic] 
° 
ah of nearly all Acacias, and which was first found by Dr. T. L. 
| ft in a wattle from the North. 
tio The arabin of the gum resins is derived from the same degenera- 
, Nof the cellulose of the cell walls. Our Araucarias contain a very 
q “netgetically with ferric chloride even in a dilute solution. 
: arabin third class of gums embraces those where the metarabin or 
q Contains some constituents of the sap from which it is derived. 
q © gum of Ceratopetalum gummiferum (the Christmas bush), os 
_ 80m of the Moreton Bay chestnut (Castanospermum austra e), an 
i ; i f arabin and 
a 
» Stained with a yellow vegatable dye, which gets brown by 
: sideroph © Eucalyptus guins of the g including Bucalpytus 
! } 2 gummy group, ; : 
; (40 per loia, E. er ebra, &c., contain about as much tannin as arabin 
A fourth ‘ice inélud . dation of an 
a co es all the resins formed by oxy 
a Pte oil, as the resins of D as Queensland 
| Reembling Queensland copal. Large quantities of this copal, 
fo this epenitous part of our gum resins from the Araucarias belongs 
00. ; ; 
shen th class receives gums and resins which differ in their 
~""Y absolutely from anything contained in the living plant. 
