164 Proceedings of Societies. 
with alcohol of 0°830 to 0°812, filtering, and then distilling the alcohol 
until two ounces remain per pound of seeds. If it stands a long time, the 
poisonous matter crystallises out. Weak alcohol exhausts the colouring 
matter.” 
Thursday, 9th April 1865.—Professor Mactaa@an, President, 
in the Chair. 
: H.R.H. the Prince of Wales was elected an Honorary Fellow of the 
ociety. 
A congratulatory address to H.R.H. the Prince of Wales on the occa- 
sion of his marriage was adopted. 
A memorial to the First Commissioner of H.M.’s Office of Works, 
asking for more accommodation at the Botanic Garden for the Herbarium 
and Library of the University, was also adopted. 
Professor Balfour read a short notice of the death of Mr John Wright 
Brown, who had acted for six years as assistant in the Herbarium depart- 
ment of the University Museum. 
The following Communications were read :— 
I. Note on Lemania variegata of Agardh. By Grorce Lawson, LL.D., 
Ph.D., Professor of Chemistry and Natural History in the Queen’s 
University of Canada. 
(This paper appears in the present number of this Journal.) 
II. Some Account of Paullinia sorbilis and its Products. By T. C, 
Arcuer, Esq., Director of the Industrial Museum of Scotland. 
III. Notice of Observations by F. Coun, Breslau, on the Contractile 
Filaments of the Stamens in Thistles. Communicated by Dr A.rx- 
ANDER Dickson. 
(This paper will appear in next number of this Journal ) 
IV. On an Easy and Effective Style of Nature-printing. By Mrs 
Srirxine of Kippenross. Communicated by T. C. Arcuer, Esq. 
Take some finely powdered lamp-black, mix it smoothly with fine 
almond oil and a small proportion of pale drying oil, till of the consis- 
tence of very thick cream. ‘The paper used should be of a soft spongy 
kind. Smooth crayon paper or fine Bristol board is best; a hard, rough- 
grained paper will not answer well. Take a small branch where the 
leaves are nearly perfect. As accuracy is chiefly required, it is better to 
lay the branch face downwards on your paper, and with a pencil lightly 
trace out the stem and side branches, marking where the principal groups 
of leaves lie,—this will ensure a more faithful copy than sketching the 
branch by sight. Place the branch upright before you in a pot of wet 
sand, and then you can either strip off these leaves and print them, or by 
having other branches beside you, you can select leaves resembling those 
of your model, remembering that the side of the branch next your right 
hand is on the left of the paper. ‘Take the finger off a clean white kid 
glove, put a small bit of jeweller’s cotton into it, so that when you put 
the glove finger on the first finger of your right hand, the cotton forms a 
: 
a 
