ABSTRACT OF PROCEEDINGS. xlv. 
this particular channel ; (6) other conditions being the same, the 
velocity increases as R%, where R is the mean hydraulic radius ; 
(c) the velocity increases with increase of temperature, this indi- 
cates (when taken in conjunction with (a) above, where n = 2°14) 
that the exponent (2~)/n in Prof. Reynolds’ formula is inappli- 
cable to the present experiments, since it would make the correction 
for temperature negative. The propriety of this formula had 
been challenged by Mr. Knibbs, and the value 2—shewn not to 
be supported by existing experiments when 2 was less than 2. 
This result disposes of any uncertainty that might be conceived 
to have remained. 
3. ‘Current Papers, No. 3,” by H. C. RusskE xt, B.A., C.M.G., F.R.S. 
(This paper will be printed in Vol. xxxi1., for 1898.) 
4. “Notes on Myrticolorin,” by Henry G. Surru, F.c.s., Techno- 
logical Museum, Sydney. 
In the abstract of proceedings for August 4th, a paper by Mr. 
Smith is noticed wherein is announced a new dye-stuff obtained 
from the leaves of the “Red Stringy Bark,” Lucalyptus macro- 
rhyncha. This material, which in some respects is allied to 
aromadendrin, was stated to belong to the quercetin group of 
natural dyes, It was named by the author Myrticolorin as it 
was supposed to be the only true dye substance obtained from 
the Myrtacew. This note amplifies previous statements by 
recording the results arrived at since the announcement above 
referred to. Myrticolorin is a glucoside of quercetin, and it breaks 
up on boiling with dilute sulphuric acid into quercetin and a 
Sugar. Quercetin is proved by its reactions, and the formation 
of acetylquercetin 189—191° CG. It has also been proved to be 
quercetin by Mr. A. G. Perkin of Leeds, the well known authority 
on the natural yellow dyes. The sugar belongs to the glucoses, 
it partly crystallises in microscopic transparent prisms, probably 
monoclinic. It is readily and entirely fermented by yeast, and 
reduces Fehling’s solution on heating. Myrticolorin contains 48 
~50 per cent. of quercetin, and quantitative determinations on 
