TRANSACTIONS OF SECTION A. G47 



antarctic summer, on the other. A possible explanation may he the large north- 

 ward movement of ice occurring in the antarctic summer prior to February. 



The paper also dealt very briefly with the results of tidal observations and 

 atmospheric electricity. 



4. On the possible Connection between Earthquakes and Great Waves in 

 distant places. By Rev. H. V. Gill, S.J. 



In a paper read at the Royal Dublin Society ^ two years ago it was shown 

 that there are grounds for the supposition that, under certain conditions, an 

 earthquake in one locality may well be the immediate occasion of the occurrence 

 of one or more succeeding shoclrs in other places on the earth's surface sym- 

 metrically placed with respect to it. This view was based on the fact that great 

 earthquakes frequently cause a 'wobble' in. the rotation of the earth. The 

 effect of this is to produce a strain in other portions of the earth's mass, and a 

 tendency for movable matter to shift its position, thus precipitating approaching 

 earthquakes. An examination of earthquake records showed that this series of 

 reactions may often have taken place. In the present paper the same principles 

 are invoked to show that, in the same way, an earthquake may give rise to a 

 water wave at a distant place, tho" accounting for the genesis of waves other- 

 wise difficult to explain. These principles were illustrated by experiments with 

 hollow tops containing movable matter, such as steel balls and melted wax. 



5. Some Particulars of the British Association Storm o/1908. 

 By Dr. W. N. Shaw, F,R.S. 



The author exhibited the original records of pressure, of direction and force 

 of the wind, and of rainfall at various stations in connection with the Meteoro- 

 logical Office during the passage across the British Isles of the deep depressions 

 which crossed the Irish Sea during the night of August 81-September 1, 1908. 



6. The Great Snowstorm of April 25, 1908, By Miss C, O. Stkvens, 



•7. On the Velocity of the Reducing Action of Electrolytic Hydrogen on 

 Arsenious and Arsenic Acids when liberated from the surface of 

 different elements. By W. Thomson. 



These experiments were commenced with a view to finding the velocities at 

 which arsenic is liberated as arseniuretted hydrogen (AsHj) from solutions 

 of arsenious and arsenic acids respectively when using cathodes of different 

 elements. 



The experiments were made by passing, during intervals of two and a half 

 minutes, the hydrogen containing arseniuretted hydrogen liberated from the cathode 

 through drawn out hard glass tubes accurately graduated as regards diameter and 

 heated to redness near the drawn out portion by which the arseniuretted hydrogen 

 was decomposed, liberating arsenic in the elemental condition which deposited on 

 the drawn out portion of the tube (which was kept cold by running water) as a dark 

 metallic-looking mirror, the amounts of arsenic thus deposited being measured by 

 the density of these mirrors as compared with standard mirrors for each period of 

 2^ minutes till no further mirror was deposited during one interval. 



Fifty units of arsenic were employed for each experiment dissoh'ed in 30 c.c. 

 dilute sulphuric acid, each unit consisting of 0-000,000,5413 gramme, roughly 



> XI. No, 11,1906, 



