On the Thermal Effects of Fluids in Motion. By Professor William 

 Thomson, F.E.S., and J. P. Joule, Esq., F.R.S page 41 



On the Bromide of Titanium. By F. P. Duppa, Esq. Communicated 

 by A. W. Hofmann, Ph.D., F.R.S. &c. 42 



Account of the Observations and Computations made for the purpose 

 of ascertaining the Amount of the Deflection of the Plumb Line 

 at Arthur's Seat, and the Mean Specific Gravity of the Earth ; 

 with an Account of the observed and computed Amount of the 

 Local Attraction at Arthur's Seat and at the Royal Observatory 

 at Edinburgh. Communicated by Lieut.-Col. James, R.E., F.R.S. 

 &c .45 



On some New Colouring Matters. By Arthur H. Church an 

 liam H. Perkin. Communicated by A. W. Hofmann, 



and Wil- 

 Ph.D., 

 F.R.S. &c. 



Letter from Professor Hansteen of Christiania, For. Mem. R.S. . . 49 



The Bakerian Lecture. On the Electro-dynamic Properties of Metals. 

 By Prof. WiUiam Thomson, F.R.S 60 



Supplement to the " Account of Pendulum Experiments undertaken 

 in the Hartou Colliery ; " being an Account of Experiments under- 

 taken to determine the Correction for the Temperature of the 

 Pendulum. By G. B. Airy, Esq., Astronomer Royal 68 



On the Mathematical Theory of the Stability of Earthwork and Ma- 

 sonry. By W. J. Macquorn Rankine, Esq., C.E., F.R.S. ... 60 



Letter from James P. Joule, Esq., F.R.S., in reference to the paper 

 of Dr. Woods read on the 10th of January 1856 62 



On the Presence of Fibrils of Soft Tissue in the Dentinal Tubes. By 

 John Tomes, Esq., F.R.S 63 



On the Structure and Development of the Cysticercus Cellulosae, as 

 found in the Pig. By George Rainey, Esq 66 



On the Dioecious Character of the Rotifera. By Philip Henry Gosse, 

 Esq 66 



On the Dioecious Character of the Rotifera. By Philip Henry Gosse, 

 Esq. (concluded) " . . . 66 



Account of Experiments on the Vagus and Spinal Accessory Nerves. 

 By Augustus Waller, M.D., F.R.S 69 



Extract of a Letter from P. A. Secchi, containing explanatory re- 

 marks on a Drawing of the Lunar Spot ' Copernicus,' presented by 

 him to the Royal Society 72 



Notes on the Drawing of ' Copernicus,' presented to the Royal Society 

 by P. A. Secchi. By John Phillips, Esq., F.R.S. ..*.... 73 



A Third Memoir on Quantics. By Arthur Cayley, Esq., F.R.S. . . 76 



Eem entary Considerations on the subject of Rotatory Motion. By 

 W. Gravatt, Esq., F.R.S J> .... 76 



