1887.] Mr W. Ff. R. Weldon, On a Larva of Balanoglossus. 95 
(3) On a Class of Spherical Harmonics of Complex Degree 
with application to Physical Problems. By EK. W. Hopson, M.A. 
(A bstract.) 
This paper presents an investigation of the properties of 
harmonics of degree, —$+p,/—1, and their application to the 
discussion of potential problems when the bounding surfaces are 
cones and spheres. In particular, the free electrification of two 
spherical conductors connected by a short wire of finite thickness 
is discussed. 
This paper is being printed in full in the Transactions of the 
Society. 
May 2, 1887. 
Mr Trotter, PRESIDENT, IN THE CHAIR. 
Mr F. Galton was elected a Fellow. 
The following communications were made :— 
(1) On the application of Lagrange’s equations to the motion of 
a perforated solid through a liquid when there is circulation. By 
A. B. Basset, M.A. 
(2) On the deduction of the General Dynamical Equations from 
the principle of Energy. By J. Larmor, M.A. 
May 16, 1887. 
Mr TROTTER, PRESIDENT, IN THE CHAIR. 
The following communications were made :— 
(1) On a larva of Balanoglossus. By W. F. R. WEeLDoy, M.A. 
~I 
WO, WA Pats Me 
