CONTENTS {continued). 



February 17, 1881. 



PAGE 



I. On the Viscosity of Gases at High Exhaustions. By William Ceookes, 



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 contain- 

 ing more or less rarefied G-as. By Professor G. G. Stokes, Sec. E.S. . 458 



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



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



Felruary 24, 1881. 



I. On a Simple Mode of Eliminating Errors of Adjustment in Delicate 

 Observations of Compared Spectra. By Professor Gr. Gr. Stokes, 

 Sec. E.S 470 



II. 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 



III. Further Experiments on the Action of an Intermittent Beam of Eadiant 

 Heat on Gaseous Matter. Thermometric Measurements. By J. 

 Tyndall, E.E.S. .478 



Lists of Presents 479 



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SOCIETY. 



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