311 
of Edinburgh, Session 1867-68. 
the low temperature of 290° C., it may be remarked that the first 
two or three numbers in Forbes’ table are (as he points out) pro- 
bably much less accurate than those which follow them, on account 
of the temperature at which they were obtained, which was but 
little above that of the atmosphere. 
The following Gentlemen were elected Fellows of the 
Society 
John Stevenson, Esq. 
Rev. J. F. Montgomery. 
Monday , 6th April 1868. 
Professor KELL AND, Vice-President, in the Chair. 
The following Communications were read - 
1. On the Flow of Solids, with the practical application in 
Forgings, &c. By M. Tresca, Sub-director of the Conser- 
vatoire des Arts et Metiers, Paris. Communicated by 
T. C. Archer, Esq. 
2. On the Figures of Equilibrium of Liquid Films. By Sir 
David Brewster. 
This paper is a continuation of that read on 4th February 1867, 
and already published in the Transactions. Instead, however, of 
the liquid films being formed within systems of wires, hollow glass 
vessels are here employed. By using a single or double cone of 
glass open at both ends, and inserting within it small bubbles blown 
from a quill or tube with a small aperture, regular binary, ternary, 
or quaternary systems of films are produced. Thus, by first ob- 
taining a plane film within the conical vessel, and then inserting 
upon it four small bubbles, a system is produced consisting of four 
hollow films, of curious curvature, united to one another respectively 
by vertical plane surfaces, and connected in their centres by a com- 
mon plane film, which, by adopting certain precautions, may, with 
a little care, be made to assume either a horizontal or a vertical 
2 s 
VOL. VI. 
