68 
boilin 
ferric chloride have no action on the solution. Alcohol gives s 
precipitate, again dissolved on addition of HCl. 
ANALYSIS— 
Water... a oe a re ee ce ee 
Arabin sss oe a Ss me 24°5 
_ Metarabin .. ne a oe ae .. 05°3 
100°0 
fro 
Heckel and Schlagdenhauffen in Europe and Mr. Maiden in 
country have shown e writer has observed that the arabin of the 
Araucarias gelatinises with ferric chloride, and that it differs in this 
rom the arabin of the commercial ic gum. 
Fleury (quoted by Mr. Maiden) thought the gum of Grevillea robusta 
was distinguis the same reaction “from all other kno . 
Still Fe,Cl, produces gelatinisation in arabin solutions from Melia 
composita, Albizzia Toona, and Acacia harpophylla. The gelatine 
formed by ferric chloride with Araucaria arabin is dissolved entire 
by diluted KOH; whereas the gelatine formed by Fei, Wi 
d. ae 
e cardinal point in the composition of the Araucaria resins 8 
ot and dry 
weather a resin is exuded from wounds in the bark containing 10 a 
bin 
jlution the 
aa of the turpentine resin are yao tee like in an enti : C 
. . . . . 8 . i+ y im 
Araucaria resin is boiled in water, 2 milk-white 
of emulsified resin is left undissolved on the bottom, 
solution covers it; turbid at first, but becoming quite aa an 
The resin of the Araucaria gum resin dissolves entirely that 
after elimination of the.arabin, and can be. recovere from : 
evaporation. It is a sticky resin, soluble also in ether and the est 
oils, but especially in chloroform and benzol, differing by th iO 4 
forming a yellow ey * whereas the resin of Ca ie vo effect oie 
ETE 
swells in KOH, and is dissolyed imperfectly ; H,SO 
A residue left undissolved in cold alcohol is taken 0 a . . 
rad erystallises out of this on evaporation, a0 
in alcohol 
ao Se ee Le ee 
