Letter to Dr. Sharpey, Sec. R.S., from Dr. Thomas Williams, F.R.S., 

 dated Swansea, Dec. 12, 1858 page 589 



A Sixth Memoir on Quantics. By Arthur Cayley, Esq., F.R.S 589 



On the Mathematical Theory of Sound. By the Rev. S. Earnshaw. 590 



Contributions towards the History of the Monamines. By A. W. 

 Hofinann, LL.D., F.R.S 591 



On New Nitrogen Derivatives of the Phenyl- and Benzoyl-Series. 

 By P. Griess, Esq 594 



On the Influence of the Ocean on the Plumb-line in India. By the 

 Rev. J. H. Pratt, Archdeacon of Calcutta 597 



On the Embryogeny of Comatula Rosacea (Linck). By Wyville 

 Thomson, Esq., Professor of Geology in Queen's College, Belfast. 600 



On the Stratifications in Electrical Discharges, as observed in Toricel- 

 lian and other Vacua. Second Communication. By J. P. Gassiot, 

 Esq., V.P.R.S 601 



Second Note on Ozone. By Thomas Andrews, M.D., F.R.S., and 

 P. G. Tait, M.A., F.C.P.S 606 



Ice Observations. By David Walker, M.D., Surgeon and Naturalist 

 to the Arctic Discovery Expedition 609 



Inquiries into the Phenomena of Respiration. By Edward Smith, 

 M.D., Assistant-Physician to the Hospital for Consumption, 

 Brompton 611 



On the Effect of Pressure on Electric Conductibility in Metallic 

 Wires. In a Letter from M. Elie Wartmann of Geneva to Major- 

 General Sabine, Treas. and V.P.R.S 615 



Notice of Researches on a New Class of Organic Bases, conducted by 

 Charles S. Wood, Esq. By A. W. Hofmann, LL.D., F.R.S 616 



Rectification of Logarithmic Errors in the Measurements of Two 

 Sections of the Meridional Arc of India. In a Letter to Professor 

 Stokes, Sec. R.S. By Colonel Everest, F.R.S 620 



On the Thermodynamic Theory of Steam Engines with dry saturated 

 Steam, and its application to practice. By W. J. Macquorn 

 Rankine, C.E., LL.D., F.R.S.S.L. & E., Pres. Inst. Eng. Scot., 

 Regius Professor of Civil Engineering and Mechanics in the Uni- 

 versity and College of Glasgow 626 



On Platinized Graphite Batteries. By C. V. Walker, Esq., F.R.S., 

 F.R.A.S., &c 628 



On the Aquiferous and Oviductal Systems in the Lamellibranchiate 

 Mollusks. By George Rolleston, M.D., Lee's Reader in Anatomy, 

 and Charles Robertson, Esq., Curator of the Museum, Christ 

 Church, Oxford 633 



On the Action of Nitric Acid and of Binoxide of Manganese and 

 Sulphuric Acid on the Organic Bases. By A. Matthiessen, Ph.D. 635 



Experiments on the Action of Food upon the Respiration. By Ed- 

 ward Smith, M.D., LL.B., L.R.C.P., Assistant-Physician to the 

 Hospital for Consumption, Brompton 638 



