Vll 



Page 



cama 



Description of some Eemains of the Gigantic Land-lizard (Megalc 

 prisca, Owen) from Australia. Part III. By Professor Owen, C.B., 

 F.B.S., &c , 380 



On a Method of Destroying the Effects of slight Errors of Adjustment in 

 Experiments of Changes of Eefrangibility due to Eelative Motions in 

 the Line of Sight. By E. J. Stone, F.B.S., Director of the Eadcliffe 

 Observatory, Oxford 381 



On an Improved Bimodular Method of computing Natural and Tabular 

 Logarithms and Anti-Logarithms to Twelve or Sixteen Places with 

 very brief Tables. By Alexander J. Ellis, B.A., F.E.S., F.S.A. 381 



On the Potential Eadix as a Means of Calculating Logarithms to any Ee- 

 quired Number of Decimal Places, with a Summary of all Preceding 

 Methods Chronologically Arranged. By Alexander J. Ellis, B.A., 

 F.E.S., F.S.A 392 



On the Influence of Temperature on the Musical Pitch of Harmonium 

 Eeeds. By Alexander J. Ellis, B.A., F.E.S., F.S.A 413 



February 10, 1881. 



On the Influence of the Molecular Grouping in Organic Bodies in their 

 Absorption in the Infra-red Eegion of the Spectrum. By Captain W. 

 de W. Abney, E.E., F.E.S., and Lieutenant-Colonel Festing, E.E 416 



Experiments undertaken during the Summer, 1880, at Yvoire (1,230 

 feet), Courmayeur (3,945 feet), and the " Col de Geant" (11,030 feet), 

 on the Influence of Altitude upon Eespiration. By William Marcet, 

 M.D., F.E.S 418 



On a New Seismograph. By J. A. Ewing, B.Sc, F.E.S.E., Professor of 

 Mechanical Engineering in the University of Tokio, Japan 440 



February 17, 1881. 



On the Viscosity of Gases at High Exhaustions. By "William Crookes, 



F.E.S , 446 



Note on the Eeduction of Mr. Crookes's Experiments on the Decrement 

 of the Arc of Vibration of a Mica Plate oscillating within a Bulb con- 

 taining more or less rarefied Gas. By Professor G. G. Stokes, Sec. E.S. 458 



Notes on the Earthquakes of July, 1880, at Manila. By Commander W. 

 B. Pauli, E.N., Her Britannic Majesty's Consul at Manila 460 



February 24, 1881. 



On a Simple Mode of Eliminating Errors of Adjustment in Delicate Ob- 

 servations of Compared Spectra. By Professor G. G. Stokes, Sec. E.S. 470 



Notes on Physical Geology. No. VII. On the Secular Inequalities in 

 Terrestrial Climates depending on the Perihelion Longitude and 

 Eccentricity of the Earth's Orbit. By the Eev. Samuel Haughton, 

 Professor of Geology in the University of Dublin 473 



