180 HG wien: 
water. I submitted this pigment, thus crudely prepared, to Mr. 
Fletcher Watson, a well known Sydney artist, who painted a 
sketch, the base colour of most of the tones being this yellow- 
lake. The sketch he kindly presented to me, the colours are 
still quite fresh and bright and apparently unfaded. He was very 
pleased with the colour, often spoke to me about it, and in a letter 
to me on Nov. 18th, 1887, expressed himself as follows :—‘“ I con- 
sider that when properly prepared it will be a most valuable 
pigment and supply a yellow long wanted by water colour artists, 
capable of producing a range of clear sober greens a1, present with 
difficulty obtained.” Acting on Mr. Watson’s advice I prepared 
some oil colour and submitted it to Mr. Samuel Brooks, who had 
a studio in Wentworth Court. He wrote as follows :—‘ The 
colour you submitted to me is a charming and very pure yellow. 
The absence of any tinge of red—so fatal to most yellows—is 
marked. Asa glazing colouritis rich. . . I find it will mix 
well with any colour and many fine combinations can be produced 
with it.” 
My investigations'on aromadendrin, and on its dyeing properties, 
submitted to the Society of Chemical Industry (Nov. 1896) and _ 
the subsequent determination of its probable affinity to maclurin 
or morin, suggested to me by Mr. A. G. Perkin of Leeds, again 
directed my attention to the colouring substance contained in the 
leaves of this tree (#2. macrorhyncha). This is obtained by boiling 
the dried and powdered leaves in a large quantity of water several 
times repeated, boiling for a long time and filtering through calico; 
on cooling a yellowish crystalline precipitate separates out. This 
is contaminated with a small quantity of inorganic salts, principally 
the alkalis, which combine with the substance as it crystallises 
out. By repeated crystallisation from water and alcohol the 
greater portion of the inorganic salts are removed, but it does not 
appear possible to obtain the substance absolutely pure by ordinary 
recrystallisation. When again dissolved in boiling water, filtering 
and cooling, it is obtained in yellowish microscopic hair-like 
1 Proc. Roy. Soc. N. S. Wales, Vol. xxx., p. 135, 1896. 
