158 
Tests. 
Transverse 1.—10 in. x 1 in. x 1 in. broke at 1,300 lb. 
Do. 2.— do do 1,500 lb. 
Compression 1.—6 in. x 1 in. x 1 in. broke at 9,900 lb. 
Do. 2.— do do 9,650 lb. 
Exudations. —Our specimens of this gum, collected at Mullumbimby, 
N.S.W., are jirincipally in tears, very bright and transparent, dark amber coloured, 
very brittle, and bright in fracture. It is entirely and readily soluble in cold water, 
and is in this respect one of the best of the coast Acacia gums of this Colony ; it is 
very adhesive, and its comparative viscosity is high. Unfortunately our samples 
darken much in aqueous solution. The solution is slightly acid to litmus paper. 
Eerric chloride gives a cream-coloured solid mass exactly resembling in bulk and 
colour that from A. Maideni, and it behaves in the same way as that gum with a 
saturated solution of borax, mercuric chloride, and basic acetate of lead. Both these 
gums belong to the arabin group, and if obtainable in quantity would be of some 
commercial value. As far as our samples show at present, the gum of A. Maideni 
has a better colour than that of A. Bakeri , but it is inferior to it as regards its 
adhesive properties. When warmed with dilute soda solution, the aqueous solution 
of the gum darkens considerably. The ash of this gum is remarkable in that it 
contains a large proportion of manganese. It contains 15’2 per cent, moisture and 
36 per cent. ash. (Maiden and Smith.*) 
Size. —This is probably one of the largest of all the Acacias. It has been 
found in the mountains measuring over 160 feet, with a trunk from 50-60 feet 
clear of limbs, and a diameter from 2 to 4 feet, and on the banks of creeks 140 
feet high, and in some instances “so high that the leaves could not be seen” 
(distinguished). 
Hilbitat.—Tengoggin Mount (1,000 feet), near Mullumbimby, Brunswick 
Biver, N.S.W. ; also Mullumbimby Creek, a tributary of the Brunswick 
(W. Bauerlen), 
EXPLANATION OF PLATE 111. 
A. Flowering branch. 
n. Phyllode. 
c. Flower-head. 
D. Individual hud. 
E. Flower. 
f. Flower, opened out, showing — 
(а) Calyx. 
(б) Corolla. 
(c) Stamens. 
( d) Pistil. 
g. Bract (found at the base of each flower). 
h. Stamen. 
k. Pod. 
L. Seed, remarkably flat, no aril. 
• “ Contributions to a Knowledge of Australian Vegetable Exudations, Part I,” in Journ. Roy. Soc. N.S. }V., 
xxix (1895), p. 399. 
