290 Royal Society. —Soctety of Antiquaries. 
of another compass. The intensity of the magnetic force was de- 
termined by employing a magnet to draw the needle to a hori- 
‘zontal position ; which being then removed, the needle was left 
to oscillate till the arcs became too small to be observed, and at 
every tenth vibration the are and the time were noted. The ob- 
servations were generally made upon the ice, to avoid the irregu- 
larities produced by the iron of the ship. 
March 4. A paper on the Action of Crystallized Surfaces upon 
Light, by Dr. Brewster, was read ; alsoa paper by Sir E. Home. 
on the Fossil Skeleton of an Animal, on parts of which he had 
before presented three separate papers to the Society. Sir 
Everard has been enabled to correct and amplify his former de- 
tails by means of a more perfect skeleton since discovered, in 
which the only parts wanting are some of the bones of the pelvis 
and the lower parts of the sternum. 
March 11. A paper was read, On the Pressures which sustain 
a heavy body in equilibrio, when the points of support are 
more than three, by Charles Bonnyecastle, esq. 
March 18. A letter was read from Dr. Granville, which had 
for its object to correct a mistake in his paper published in the 
last volume of the Society’s Transactions, and which had been 
pointed out to him by Dr. Maton. 
March 25.—Observations on the Peculiarity of the Tides be- 
tween Fairleigh and the North Foreland, and on the supposed 
meeting of Tides near Dungeness, by James Anderson, esq. R.N. 
—On the Ova of the Opossum Tribe, by Sir Everard Home, 
bart. 
April 1.—Results of Observations made at Trinity College, 
Dublin, for determining the Obliguity of the Ecliptic, and the 
Maximum of the Aberration of Light, by Dr. Brinkley —Addi- 
tional Remarks on the Skeleton of the Proteorrhocius, by Sir 
Everard Home, bart.—On some new Methods of investigating 
the Sums of several Classes of infinite Series, by Charles Bab- 
bage, esq. 
SOCIETY OF ANTIQUARIES OF LONDON. 
On April 23 (St. George’s Day) the Society of Antiquaries 
met at their apartments in Somerset-place, in pursuance of their 
Statutes and Charter of Incorporation, to elect a President, 
Council, and Officers of the Society for the year ensuing ; where- 
upon ” 
George Earl of Aberdeen, H. Ellis, esq. 
Right Hon. Sir J. Banks, H. Leycester, esq. 
F. A. Barnard, esq. Samuel Lysons, esq. 
W. Bray, esq. Matthew Raper, esq. 
Nicholas Carlisle, esq. Robert Smirke, jun. esq. 
T. Combe, esq. (eleven 
