[ vi ] 



XXIII. On the Equilibrium of a Mass of Homogeneous Fluid at liberty. By James 

 Ivory, K.H. M.A. F.R.S. Instit. Reg. So. Paris. Corresp., et Reg. Sc. Gottin. 

 Corresp. page 491 



XXIV. Observations on the Torpedo, with an account of some additional Experiments 

 on its Electricity. By John Davy, M.D. F.R.S. Assistant Inspector of Army 

 Hospitals. Communicated by Sir James M*^Grigor, Bart. F.R.S. Director Ge- 

 neral of the Army Medical Department 531 



XXV. Some Remarks in reply to Dr. Daubeny's Note on the Air disengaged from the 

 Sea over the Site of the recent Volcano in the Mediterranean. By John Davy, 

 M.D. F.R.S. Assistant Inspector of Army Hospitals 551 



XXVI. On the Ova of the Ornithorhynchus paradoxus. By Richard Owen, Esq. 

 Assistant Conservator of the Museum of the Royal College of Surgeons in 

 London. Communicated by Sir Anthony Carlisle, F.R.S. 555 



XXVII. Observations on the Motions of Shingle Beaches. By Henry R. Palmer, Esq. 

 F.R.S. Civil Engineer 567 



XXVIII. Analysis of the Moira Brine Spring near Ashby-de-la-Zouche, Leicester- 

 shire ; with Researches cm the Extraction of Bromine. By Andre w^ Ure, M.D. 

 F.R.S. 577 



XXIX. An Account of some Experiments to measure the Velocity of Electricity and 

 the Duration of Electric Light. By Charles Wheatstone, Esq. Professor of 

 Experimental Philosophy in King's College, London. Communicated by Michael 

 Faraday, Esq. F.R.S. ^c 583 



Index . . 593 



ERRATA. 



Phil. Trans. 1833. — page 756, line 6, for excreting read secreting 



page 759, line 25, for (Plate XXL) read (Plate XXllI.) 



