Royal Irish Acadcfini/. — Medical Society. 2]-9 



The arc which is actually measured in the heavens b^' means 

 of this instrument is determined by a formula, in which the 

 sum of three arcs is taken from the semicircumference; one of 

 them resulting Irom the actual observation, the other tWo 

 from a 'cosine and a tangent, ascertainable by computation 

 from the theorem itself. In an extensive use of this microme- 

 ter, tables may easily be formed to facilitate the computation. 



ROYAL IRISH ACADEMY. 



On Thursday, the 16th of March, the annual elections at 

 the Royal Irish Academy took place, when the several official 

 departments were filled up as follow : — President: Rev. John 

 Brinklev, D.D. F.R.S. Sic. — Vice-Presidents : Joseph Clarke, 

 M.D.; Colonel Edward Hill; the Provost of Trinity College, 

 Dublin; Wm, Brooke, ^i.T>.— Treasurer :Wm, Brooke, M.D. 

 —Secretaries : Rev. J. II. Singer, D.D. F.T.C.D. ; Rev. F. 

 Sadleir, D.D. ^.Y.T.C.T>.^Secretary of Foreign Correspon- 

 dence: Colonel E. Hill. — Librarian: Rev.W. H. Drummond, 

 D.D. — Committee of Science ; The Archbishop of Dublin ; 

 Joseph Clarke, M.D. ;. the Provost ; Rev. F. Sadleir, D.D. 

 S.F.T.C.D. ; Sir C. L. Giesecke ; Rev. R. MacDonnell, 

 D.D. F.T.C.D.; Rev. Dionysius Lardner, A.M. — Committee 

 of Polite Literature: Rev. J. H. Singer, D.D. F.T.C.D.; 

 Andr. Carmichael, Esq. ; Sam. Litton, M.D. ; Rev. C. R. El- 

 riTigton, D.D. F.T.C.D. ; Rev. W. H. Drummond, D.D. ; 

 Geo. Kiernan, Esq.; M.W. Hartstonge, Ksq. — Committee qjf 

 Antiquities : Colonel E. Hill ; Win. Brooke, M.D. ; Isaac 

 D'Olier, LL.D. ; Rev. H. H. Harte, F.T.C.D.; Tho. H. 

 Orpen, M.D. ; Hugh Ferguson, M.D. ; Sir F. L. Biosse, 

 Bart. 



MEDICAL SO'C'IETY OF LOXDON. 



The fifty-secoiVd AnniveVs/ary Meeting of this Society Wa^ 

 held on Tuesday, the 8th of March, at the London Coift'ee- 

 liouse, Ludgate-hill, William SheaiTnan, M.D. President, in 

 the chair. The Officers and Council for the year ensuiiig are: 



President: Henry Clutterbuck, M.Jj.— Vice-Presidents : 

 H. J. Cholmly, M.D. ; James .lohnson, M.D. ; Sir Astley 

 Paston Cooper, Bart. F.R.S. ; and W^illiiinl Kingdon, Esq. 

 — Treasurer : John Andree, Esq. — Librarian : DilVid Uwins, 

 M.D,— Secretaries : T. J. Pettigrew, Exj. F.A.S. F.LlS. ; 

 and Thomas Callaway, Esq. — Foreigii Secretary : Leonard 

 Stewart, M.D. — Council: Thomas Walshman, M.D.; Williani 

 Sliearnian, M.D.; C'eorge Darling, M.D.: TiiomasCox, M.D.; 

 John Russell, M.D.; J. B. .Tames, M.D. F.L.S.; Edward 

 Morton, M.D. ; George Drysdale ; Edward Sutclifle ; Hurton 

 1'. 2 Hidwii : 



