Chemical Examination of Burmese Naphtha, or Rangoon Tar. By 

 Warren De la Rue, Ph.D., F.R.S., and Hugo Miiller, Ph.D. page 221 



Experimental Researches on the Organ of Vision. Part I. Micro- 

 scopic Examination of the Circulation of the Blood in the Vessels 

 of the Iris and of the Choroid Membrane, &c. By Augustus Waller, 

 M.D.,F.R.S 229 



Researches on the Action of certain parts of the Solar Spectrum upon 

 the Iris. By E. Brown-Se"quard, M.D. Communicated by Dr. 

 Sharpey, Sec. R.S 233 



Photo-chemical Researches. Part I. On the Measurement of the 

 Chemical Action of Light. By Professor Bunsen of Heidelberg, 

 and Henry Enfield Roscoe, B.A., Ph.D. Communicated by Prof. 

 Stokes, Sec. R.S *. . . 234 



Photo-chemical Researches. Part I. On the Measurement of the 

 Chemical Action of Light. By Professor Bunsen and Dr. H. E. 

 Roscoe (concluded) 235 



Address of the President ' 240 



Obituary Notices of Deceased Fellows : 



Jaques Charles Francois Sturm 260 



The Rev. William Buckland, D.D 264 



Dr. William Frederick Chambers 268 



Sir Alexander Crichton 269 



George James Guthrie, Esq 272 



Daniel Sharpe, Esq 275 



James Meadows Rendel, Esq 279 



Rear- Admiral Frederick William Beechey 283 



Observations made to ascertain the Specific Gravity of Sea-water 

 in the Northern and Southern Hemispheres. By Rear-Admiral 

 Philip P. King, R.N., F.R.S. &c 291 



On the Existence of Silver in Sea- water. By Frederick Field, F.C.S. 292 



On the Causes of the great Variation among the different measures 

 of the Earth's Mean Density. By Captain W. S. Jacob, Director 

 of the Observatory at Madras . . 295 



On Practical Methods for Rapid Signalling by the Electric Tele- 

 graph. By Prof. W. Thomson, F.R.S 299' 



On Practical Methods for Rapid Signalling by the Electric Tele- 

 graph. (Second Communication.) By Prof. W. Thomson, F.R.S. 303 



On the Equation of Laplace's Functions, &c. By W. F. Donkin, M. A., 

 F.R.S., F.R.A.S., Savilian Professor of Astronomy, Oxford . . 307 



A Memoir on Curves of the Third Order. By Arthur Cayley, Esq., 

 F.R.S . . .... 310 



On the ^-partitions of a Polygon and Polyace. By the Rev. T. P. 

 Kirkman, M.A. . . 311 



On the Scelidothcre (Scelidotherium Jeptocephalum, Owen), a lanrc 

 extinct Terrestrial Sloth. By Prof. R. Owen, F.R.S. . ... 31^ 



