vii 



Page 



Preliminary Notice of Kesults of Pendulum Experiments made in India. 

 By Lieut. -Col. Walker, F.E.S 318 



On the Appendicular Skeleton of tlie Primates. By St. George Mivart, 

 F.Z.S 320 



Actinometrical Observations among the Alps, with the Description of a New 

 Actinometer. By the Rev. George C. Hodgkinson 321 



An Eighth Memoir on Quantics. By Professor Cayley, F.P.S 330 



On a New Method of Calculating the Statical Stability of a Ship. By C. 

 W. Merrifield, F.R.S., Principal of the Eoyal School of Naval Architec- 

 ture 332 



Transformation of the Aromatic Monamines into Acids richer in Carbon. 

 By Augustus W. Hofmann, LL.D., F.R.S., i&c 335 



On the Elimination of Nitrogen by the Kidneys and Intestines during Best 

 and Exercise, on a Diet without Nitrogen. By E. A. Parkes, M.D., F.R.S. 339 



Account of Experiments on Torsion and Flexure for the Determination of 

 Rigidities. By J. D. Everett, D.C.L 356 



On the Relation of Insolation to Atmospheric Humidity. By J. Park Har- 

 rison, M.A ib. 



On the Conversion of Dynamical into Electrical Force without the aid of 

 Permanent Magnetism, By C. W. Siemens, F.R.S 367 



On the Augmentation of the Power of a Magnet by the reaction thereon of 

 Currents induced by the Mag-net itself. By Charles Wheatstone, F.R.S. 369 



A brief Account of the ' Thesaurus Siluricus,' with a few facts and inferences. 

 By J. J. Bigsby, M.D 372 



On a Transit-Instrument and a Zenith Sector, to be used on the Great Tri- 

 gonometrical Survey of India for the determination, respectively, of Lon- 

 gitude and Latitude. By Lieut.-Colonel A. Strange, F.R.S 385 



On the Orders and Genera of Ternary Quadratic Forms. By Henry J. 

 Stephen Smith, M.A., F.R.S 387 



On the Influence exerted by the Movements of Respiration on the Circula- 

 tion of the Blood. Being the Croonian Lectiu'e for 1867, delivered by 

 Dr. J. Burdon Sanderson 391 



Note on Mr. Merrifield's New Method of calculating the Statical Stability 

 of a Ship. By W. J. Macquorn Rankine, C.E., LL.D., F.R.S 396 



On the Theory of the Maintenance of Electric Currents by Mechanical 

 "Work without the Use of Permanent Magnets. By J. Clerk Maxwell, 

 F.R.S 397 



On certain Points in the Theory of the Magneto-electric Machines of Wilde, 

 Wheatstone, and Siemens. By C. F. Varley. In a Letter to Professor 

 Stokes, Sec.R.S 403 



On a Magneto-electric Machine. By William Ladd, F.R.M.S 404 



Computation of the Lengths of the Waves of Light corresponding to the 

 Lines in the Dispersion-Spectrum measured by Kirchhofl. By George 

 Biddell Airy, F.R.S., Astronomer Royal 405 



