CIV THE ROYAL SOCIETY OF CANADA 
Feb. 9, 3p.m.—‘Some Geometrical Problems connected with Geo- 
desy,”’ by W. F. King, C.M.G. 
Feb. 23, S8p.m.—‘‘Some Recent Interesting Developments in As- 
tronomy,” by J. S. Plaskett, B.A. 
Mar. 9, 3p.m.—‘‘Errors in Field Observations,’ by F. A. Mc- 
Diarmid, B.A. 
Mar. 23, 8 p.m.—“ At Home” Reception at Observatory: Illustrated 
Demonstrations; Refreshments. 
April 3, Sp.m.—‘‘Photography of the Heavens,’ by Professor 
Ritchey, Solar Observatory, Mount Wilson. 
April 20, 3p.m.— Absolute and Relative Motion: The Relativity 
Principle,’ by R. M. Stewart, M.A. 
May 4, 8 p.m.—‘‘The Astronomy of Shakespeare,’ by J. A. Pater- 
son, K.C. 
May 23, 3p.m.—(a) “Personal Errors of Bisection in Meridian Circle 
Work,” by D. B.Nugent, M.A.; 
(b) “Personal Errors in the Measurement of Spec- 
tral line Displacements,” by R. E. DeLury, Ph.D. 
The following is a brief extract of each of the technical papers 
presented at the afternoon meetings. 
1.—“ Terrestrial Magnetism,” by Otto Klotz, gave a statement of the 
main facts of the earth’s magnetism, its relation to other branches 
of science, more especially to seismology, and a few of the latest 
important discoveries. 
2.—“Trregularities in the Velocity Curves of Some Stars,” by W. E. 
Harper, gave examples of such irregularities which have been en- 
countered in the work at the Dominion Observatory, with a 
discussion as to their probable causes. 
3.—‘‘Systematic errors in Estimating Relative Positions of Wires,” by 
R. M. Stewart, discussed the errors depending on personality which 
occur in measuring the position of marks of various kinds, with a 
telescope micrometer. Particular cases of practical interest were 
referred to and their effect on deduced star places discussed. 
4.—“Notes from two Recent Astronomical Gatherings,” by J. S. 
Plaskett, was a report of the meetings of the Astronomical and 
Astrophysical Society at Harvard Observatory, August 17 to 19, 
1910, and of the Solar Conference at Mount Wilson, California, 
of the same year. 
5.—“Some Geometrical Problems connected with Geodesy,” by W. F. 
King, discussed the modifications of the methods of spherical trigo- 
nometry necessary in extensive triangulations owing to the assump- 
tion that the earth is an oblate spheroid of small eccentricity. 
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