CX 
THE ROYAL SOCIETY OF CANADA 
4.—“The Making of a Great Telescope,” by Dr. J. A. Brashear, Alle- 
gheny, Pa., described the very interesting and delicate operations 
of grinding and polishing large lenses and the exceedingly sensitive 
methods of testing the finished surfaces. 
5.—“ Precise Levelling in Canada,” by F. B. Reid, D.L.S., described 
the instruments and methods employed in carrying out precise 
levelling in connection with the Geodetic Survey of Canada and 
touched on the value and necessity of the work, and the territory 
already covered. 
6.—“ Review of Current Progress in Astronomy,” consisted of short 
D 
= 
papers as follows: “Parallax Determination” by R. J. McDiarmid, 
M.Sc., ‘New Method in Chemical Analysis” by R. E. Delury, Ph.D., 
“Star Collisions” by C. C. Smith, B.A., “Wireless Telegraphy ” 
by W. A. Dier, “Calcium Cloud in Spectroscopic Binaries” by W. 
A. Harper, M.A. 
7.— “The Solar Rotation,” by R. E. DeLury, Ph.D., discussed the 
measurements of sixteen rotation plates taken in various latitudes 
of the sun and the part that systematic errors play in the determina- 
tion of the sun’s rotation by this method. 
At the Annual Meeting held December 21st. 1911 the following 
officers were elected for the ensuing year. 
President.—J. A. Plaskett, B.A. 
Vice-President.—-R. M. Stewart, M.A. 
Secretary.—Carl Engler, B.A., D.L.S. 
Treasurer.—C. C. Smith, B.A., D.L.S. 
Council.—F. A. McDiarmid, B.A., W. E. Harper, M.A., R. E. 
DeLury, Ph.D., and past Presidents, W. F. King, C.M.G., LL.D., 
Otto Klotz, LL.D. 
XII.—Report of The Ottawa Field Naturalists’ Club. 
Presented by E. H. BLACKADER, B.A., Secretary, Delegate. 
On behalf of the Ottawa Field Naturalists’ Club I present herewith 
the report for the past vear. 
MEMBERSHIP. 
During the past year 16 new members have been elected, 15 mem- 
bers have sent in their resignations, and 3 have died. This leaves our 
present membership 309, composed of 302 active members and 7 
