CONTENTS. IX 



MONDAY, SEPTEMBER 5. 



Physical Department. 



Page 



1. Report of the Committee ou Meteoric Dust 540 



2. Report of the Committee ou Tidal Observations in the English Channel 



and the North Sea 540 



3. Report of tlie Committee on Underground Temperature 540' 



4. Report of the Committee on the Calculation of Sun-heat Coefficients 540 



5. Observations of Atmospheric Electricity at the Kew Observatory during 



1880. By G. M. Whipple, B.Sc, F.R.A.S 540 



6. On a Universal Sunshine Recorder Stand. By G. M. Whipple, B.Sc, 



F.R.A.S 640 



7. On the Calibration of Merciuial Thermometers by Bessel's Method. By 

 Professors T. E. Thobpe, Ph.D., F.R.S., and A. W. RticKEE, M.A 540' 



8. On the General Coincidence between Sun-spot Activity and Terrestrial 



Magnetic Disturbance. By the Rev. F. Howlett, F.R.A.S 541 



9. On Magnetic Disturbances and Earth-currents. By Professor W. Gkylls 

 Adams, F.R.S 542 



10. On the Arrestation of Infusorial Life by Solar Light. By Professor 

 John Tyndall, F.R.S 543 



11. On a new Integrating Anemometer. By the Rev. J. M. Wilson, M.A., 

 and H. S. Hele Shaw 643 



12. On the Isothermals of the British Isles. By Alex. Buchan, M.A., 

 F.R.S.E 644 



13. On the Diurnal Period of Hailstorms. By Axex. Buchan, M.A., 



F.R.S.E 544 



14. On the Sunspot Period, and Planetary Tides in the Solar Atmosphere. 



By F. B. Edmonds 544 



15. Some Laws which regulate the Succession of Mean Temperature and 

 Rainfall in the Climate of London. By H. Oottetenat Fox, M.R.C.S.... 644 



16. On the Blowing Wells near Northallerton. By Thomas Fairley, 



F.R.S.E 544 



17. Some Remarks on Artificial Flight. By Feed. W. Breaeey, Hon. 

 Secretary of the Aeronautical Society 545 



18. On the desirability of observing Occultations of Stars, of the first and 

 other bright magnitudes, from places where they are to be seen near the 

 horizon. By H. S. Williams, M.A., F.R.A.S 547 



Mathematical Department. 



1. Sur la representation des rotations autour d'un point par des points de 



I'espace. By Cyparissos Stephanos 547 



2. On the Polar Planes of a point with respect to four Quadiic Surfaces. 



By W. Spoxtiswoode, M..\., Pres. R.S 547 



8. On the Extension of the Theory of Screws to the Dynamics of any 

 material system. By Robert S. Ball, LL.D., F.R.S., Royal Astronomer 

 of Ireland * 647 



4. Ou a Property of a small Geodesic Triangle on any surface. By Professor 

 H. J. S. Smith, M.A., F.R.S 64* 



