Yin 



March 19, 1903. 



Sir WILLIAM HUGGINS, K.C.B., O.M., President, in the Chair. 



A List of the Presents was laid on the table, and thanks ordered for 

 them. 



The following papers were read : — 



I. "On the Formation of Barrier Eeefs and of the Different Types 

 of Atolls." By Professor Alex. Agassiz, For. Mem. E.S. 



II. " On Central American Earthquakes, particularly the Earthquake 

 of 1838." By Admiral Sir John Dalrymple Hay, F.R.S. 



III. "The Emanations of Eadium." By Sir William Crookes, 

 F.B.S. 



March 26, 1903. 



Professor G. CAREY FOSTER, Vice-President, in the Chair. 



A List of the Presents was laid on the table, and thanks ordered for 

 them. 



The following papers were read : — 



L " Some Physical Properties of Nickel Carbonyl." By Professor 

 J. Dewar, F.R.S., and H. 0. Jones. 



II. " The Electrical Conductivity imparted to a Vacuum by Hot 

 Conductors." By 0. W. Richardson. Communicated by 

 Professor J. J. Thomson, F.R.S. 



III. " An Attempt to Estimate the Relative Amounts of Krypton 



and of Xenon in Atmospheric Air." By Sir William 

 Ramsay, F.R.S. 



IV. "On a New Series of Lines in the Spectrum of Magnesium." 



By A. Fowler. Communicated by Professor H. L. 

 Callendar, F.R.S. 



V An Enquiry into the Variation of Angles observed in 

 Crystals; especially of Potassium-Alum and Ammonium- 

 Alum." By Professor H. A, Miers, F.R.S. 



