1901-2.] 
Meetings of the Society. 
583 
2. Quaternion Binaries : an extension of Quaternions to give an eight- 
element system applicable to ordinary space. By Wm. Peddie, D.Sc. 
p. 70. 
3. Relation of Miller’s Trisector to the Quartic Trisectrix, with a 
description of a Seven-bar Limagonograph. By Professor Chrystal. 
pp. 17-20. 
THIRD ORDINARY MEETING. 
Monday , 2nd December 1901. 
The Right Hon. Lord Kelvin, G.C.Y.O., President, in the Chair. 
The following Communications were read : — 
1. Obituary Notice of Professor Tait. By the President, vol. xxiii. 
pp. 498-504. 
2. On the State of Equilibrium of Stellar Atmospheres. (Second 
Part.) By Dr J. Halm, Assistant Astronomer, Royal Observatory, 
Edinburgh. Communicated by the Astronomer-Royal for Scot- 
land. 
3. The President showed a Model of Diatomic Equilateral Crystalline 
Assemblage described in his paper on “ Molecular Constitution of Matter,” 
R.S.E., July 1889. 
George Johnstone, Lieut. R. N. R., Marine Superintendent, 
British India Steam Navigation Co., and J T. Ewen, B.Sc., 
Memb. I. Mech. E., H.M.I.S., were balloted for, and declared duly 
elected Fellows of the Society. 
FOURTH ORDINARY MEETING. 
Monday , 1 Qth December 1901. 
Professor Geikie, LL.D., Yice-President, in the Chair. 
The following Communication was read : — 
A Bathymetrical and Geological Study of the Lakes of Snowdonia 
and Eastern Carnarvonshire. By T. J. Jehu, M.B., B.Sc., F.G.S. 
Communicated by Professor Geikie. (With Lantern Illustrations .) 
Trans., vol. 40, pp. 419-467. 
