L xii ] 
IX. On the means adopted in the British Colonial Magnetic Observatories for deter- 
inining the absolute Values, Secular Change, and Annual Variation of the Mag- 
netic Force. By Lieut. -Colonel Edward Sabine, R.A., For. Sec. R.S. page 201 
X. Observations on the Freezing of the Albumen of Eggs. By James Paget, Esq., 
Professor of Anatomy and Surgery to the Royal College of Surgeons of England. 
Communicated by Thomas Bell, Sec. R.S 221 
XL Researches on the Tides. — Fourteenth Series. On the Results of continued Tide 
Observations at several places on the British Coasts. By the Rev. W. Whewell, 
D.D., F.R.S. • 227 
XII. Experiments and Observations upon the Properties of Light. By Lord Brougham, 
F.R.S., Member of the National Institute, and of the Royal Academy of 
Naples 235 
XIII. General Methods in Analysis for the resolution of Linear Equations in Finite 
Differences and Linear Differential Equations. By Charles James Har- 
greave. Esq., LL.B., F.R.S. , Professor of Jurisprudence in University College, 
London 261 
XIV. Electro-Physiological Researches. — Eighth Series. By Signor Carlo Matteucci. 
Communicated by W. R. Grove, Esq., F.R.S 287 
ERRATA. 
The plant mentioned by Professor Macaire in his paper, published in the Philosophical Transactions for 
1S48, p. 253, as Tamus communis, is not Smilax aspera, as suggested in the note at that page, but Bryonia 
dioica. 
Page 243, line 9, for E read F. 
257, line 25, for light read night. 
257, line 29, for polarity read polarization. 
