SI 2 City Philosophical Society. — Medical Society. 



fixed stars, so as to obtain a correct scale whereby astronomers 

 may be enabled to express themselves in one common language 

 on this subject. — A method oF applying the Reflecting Tele- 

 scope to transit or circular Instruments, in as convenient and 

 useful a manner as the Refracting Telescope. 



The Society's Gold Medal and Twenty Guineas are also of- 

 fered for the best paper on the theory of the motions and per- 

 turbations of the satellites of Saturn. — The investigation to be 

 so conducted as to take expressly into consideration the influ- 

 ence of the rings, and the figure of the planet as modified by the 

 attraction of the rings, on the motions of the satellites : to fur- 

 nish formuliE, adapted to the determination of the elements of 

 their orbits, and the constant co-efficients of their periodical 

 and secular equations, from observation : likewise to point out 

 the observations best adapted to lead to a knowledge of such 

 determination. The papers to be sent on or before the 1st of 

 February 1824. 



CITY PHILOSOPHICAL SOCIETY. 



We would suggest to our correspondent Mr. Harris, that 

 an institution similar to the one which he wishes to form, has 

 been established several years, where lectures are delivered 

 every fortnight, original papers are read, and subjects connect- 

 ed with the various branches of science are discussed by the 

 members. Its object is to aflfbrd every facility to those who 

 may wish to obtain scientific information. As we are ac- 

 quainted with several of its membei's, we do not hesitate to 

 recommend to the attention of Mr. H. and his friends the City 

 Philosophical Society, whose meetings are held at the house of 

 Mr. Tatum, 53, Dorset-street, Salisbury-square, where further 

 information may be obtained. 



. MEDICAL SOCIETY OF LONDON, BOLT-COURT, FLEET-STREET. 



In conformity with the Will of the late Dr. Anth. Fothergill, 

 the Society resolve to give annually to the Author of the best 

 Dissertation on a Subject proposed by them, a Gold Medal, 

 value Twenty Guineas, called the " Fothergillian Medal," for 

 which the Learned of all countries are invited as Candidates. 



1. Each Disse tation offered for this Prize must be delivered 

 to the Registrar, in the Latin or English Language, on or be- 

 fore the 31st day of December. 



2. With it must be delivered a sealed packet, with some 

 motto or device on die outside; and within, the Author's name 



and 



