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| On the Action of the Second Surfaces of transparent Plates upon Light. By David Brewster, LL.D. F.R.S. L.& E. | page 395 | |
| Observations made with the Invariable Pendulum (No. 4. Jones), at the Royal Observatory, Cape of Good Hope, for the purpose of determining the Compression of the Earth. By the Rev. Fearon Fallows, F.R.S. | 396 | |
| Statement of the principal Circumstances respecting the united Siamese Twins now exhibiting in London. By George Buckley Bolton, Esq. | 397 | |
| On some Properties in Achromatic Object-glasses applicable to the Improvement of the Microscope. By Joseph Jackson Lister, Esq. | 399 | |
| On the Pendulum. By J. W. Lubbock, Esq. F.R.S. | 401 | |
| On the Theoretical Investigation of the Velocity of Sound, as corrected from M. Dulong's recent Experiments, compared with the Results of the Observations of Dr. Moll and Dr. Van Beek. By Dr. Simons. | 401 | |
| On the Elasticity of Threads of Glass, with some of the most useful Applications of this property to Torsion Balances. By William Ritchie, A.M. F.R.S. | 402 | |
| Memoir on the occurrence of Iodine and Bromine in certain Mineral Waters of South Britain. By Charles Daubeny, M.D. F.R.S. | 402 | |
| Experiments to determine the Difference in the Number of Vibrations made by an Invariable Pendulum in the Royal Observatories of Greenwich and Altona. By Captain Edward Sabine, Sec. R.S. | 403 | |
| Experiments to ascertain the Correction for Variations of Temperature, within the limits of the natural Temperature of the Climate of the South of England, of the Invariable Pendulum recently employed by British Observers. By Captain Edward Sabine, Sec. R.S. | 404 | |
| On a new Register-Pyrometer, for measuring the Expansions of Solids, and determining the higher Degrees of Temperature upon the common thermometric Scale. By J. Frederic Daniell, Esq. F.R.S. | 404 | |
| On the Phenomena and Laws of Elliptic Polarization, as exhibited in the Action of Metals upon Light. By David Brewster, LL.D. F.R.S. L. & E. | 406 | |
| Researches in Physical Astronomy. By John William Lubbock, Esq. F.R.S. | 408 | |
| On the Error in Standards of Linear Measure, arising from the thickness of the Bar on which they are traced. By Captain Henry Kater, V.P. and Treas. R.S. | 408 | |
| On the Illumination of Light-houses. By Lieutenant Thomas Drummond | 410 | |
| On the Electro-magnetic Properties of metalliferous Veins in the Mines of Cornwall. By Robert Were Fox | 411 | |
| Sequel to a Paper on the tendency to Calculous Diseases, and on the Concretions to which such Diseases give rise. By John Yelloly, M.D. F.R.S. &c. | 412 | |
