Astronomical Society. 137 
observations of circumpolar stars in zenith-distance above and 
below the pole, from which twice the co-latitude becomes 
known. Employing his own constant of refraction, he obtains 
from observations of 32 circumpolar stars above and below 
the pole 77° 3! 55",65 for the mean double co-latitude; thence 
38° 31! 57",82, and 51° 28’ 2",18 for the latitude; a result 
which accords with his independent observations on the sol- 
Stices. ; 
Mr. Groombridge next proceeds to deduce from this, the 
co-latitude of the Royal Observatory. He determines the dif- 
ference of the zeniths of the two observatories at 35",25, which 
applied to the latitude of the Blackheath Observator Say 
addition, gives 51° 28! 37,43 for that of the Royal Obser- 
vatory, being less than Mr. Pond makes it by more than a se- 
cond. Mr. Groombridge imputes the difference to an erroneous 
constant of refraction. The author concludes his paper, by 
presenting some simple formule for finding the position of a 
transit instrument, from the observed transits of a high and low 
star, passing the meridian to thé south of the zenith ; or from 
the observed transit of a circumpolar star above and below the 
pole. : 
There was next read, a communication from Sir Thomas 
Brisbane, dated Paramatta, 2d July, 1825. The contents were, 
Ist. Observations with a repeating circle for the winter sol- 
stice 1825, extending from June 12 to J uly 1 inclusive. These 
are not yet reduced. 2dly. Observations on the inferior con- 
Junction of Venus and the Sun, May 1825, with the mural cir- 
cle, from May 1st to the 25th inclusive. 3dly. Observations on 
the dip of the magnetic needle, March 1825;—the mean of the 
whole was 62° 41! 35", 4thly. Observations on the declina- 
tion of the needle in March, April, and May, 1825 ;—the mean 
of the whole is 8° 59! 48", Lastly. An abstract of the mete- 
orological Journal kept at Paramatta, from April 1824 to 
April 1825. 
Feb. 10.—The Sixth Annual General Meeting of the Society 
was this day held at the Society’s rooms in Lincoln’s Inn Fields, 
for the purpose of receiving the Report of the Council upon 
the state of the Society’s affairs, electing Officers for the en- 
suing year, &c. &c. 
The President, F. Baily, Esq. in the chair. 
From the Report, which was read by Dr. Gregory, we give 
the following extracts : 
“« In meeting the Astronomical Society of London at its Sixth 
Anniversary, the Council have great pleasure in being enabled 
still to use the language of cordial congratulation : for not only 
does the number of. the Members and Associates of the So- 
Vol. 67. No. 334. Feb. 1826. Ss ciety 
