xvii 



Additional Experiments and Observations on the Application of Elec- 

 trical Combinations to the Preservation of the Copper Sheathing of 

 Ships, and to other purposes. By Sir Humphry Davy, Bart. 

 P.R.S page 213 



On the apparent Direction of Eyes in a Portrait. By William Hyde 

 Wollaston, M.D. F.R.S. and V.P 214 



Further Particulars of a Case of Pneumato-thorax. By John Davy, 

 M.D. F.R.S 215 



On the Action of finely divided Platinum on Gaseous Mixtures, and 

 its Application to their Analysis. By William Henry, M.D. F.R.S. 216 



A Comparison of Barometrical Measurement, with the Trigonometrical 

 Determination of a Height at Spitzbergen. By Captain Edward 

 Sabine, F.R.S 217 



Experimental Inquiries relative to the Distribution and Changes of the 

 Magnetic Intensity in Ships of War. By George Harvey, Esq. ... 218 



Experiments on the Elasticity and Strength of Hard and Soft Steel. 

 By Mr. Thomas Tredgold 218 



A short Account of some Observations made with Chronometers, in 

 two Expeditions sent out by the Admiralty, at the recommendation 

 of the Board of Longitude, for ascertaining the Longitude of Ma- 

 deira and of Falmouth. By Dr. John Lewis Tiarks 219 



Of the Effects of the Density of Air on the Rates of Chronometers. 

 By George Harvey, F.R.S.E. &c 220 



A Letter from Lewis Weston Dillwyn, Esq. addressed to Sir Hum- 

 phry Davy, Bart. P.R.S 221 



An Account of the Organs of Generation of the Mexican Proteus, 

 called by the Natives Axolotl. By Sir Everard Home, Bart. V.P.R.S. 221 



An Account of Experiments on the Velocity of Sound, made in Hol- 

 land. By Dr. G. Moll and Dr. A. Van Beek 221 



A Catalogue of nearly all the principal fixed Stars between the Zenith 

 of Cape Town, Cape of Good Hope, and the South Pole, reduced to 

 the 1st of January, 1824. By the Rev. Fearon Fallows, M.A. 

 F.R.S 222 



Remarks on the Parallax of Lyrae. By J. Brinkley, D.D. F.R.S. &c. 222 



Observations of the apparent Distances and Positions of 380 Double 

 and Triple Stars, made in the Years 1821, 1822, and 1823, and 

 compared with those of other Astronomers ; together with an Ac- 

 count of such Changes as appear to have taken place in them since 

 their first Discovery. Also a Description of a Five-feet Equatorial 

 Instrument employed in the Observations. By John Frederick Wil- 

 liam Herschel, Esq. F.R.S. and James South, Esq. F.R.S 224 



1825. 



On the Effects of Temperature on the Intensity of Magnetic Forces ; 



and on the Diurnal Variation of the Terrestrial Magnetic Intensity. 



By Samuel Hunter Christie, Esq. M.A -. page 225 



The Croonian Lecture. On the Existence of Nerves in the Placenta. 



By Sir Everard Home, Bart. V.P.R.S 226 



b 





