PROCEEDINGS OE 



THE EOYAL SOCIETY. 



vol. xx. No. 130. 



CONTENTS. 



November 16, 1871. 



PAGE 



I. Considerations on the Abrupt Change at Boiling or Condensing in reference 

 to the Continuity of the Fluid State of Matter. By Professor James 

 Thomson, LL.D 1 



II. Contributions to the History of the Opium Alkaloids. — Part III. By C. R. A. 

 Weight, D.Sc, Lecturer on Chemistry in St. Mary's Hospital Medical 

 School 8 



III. On a Periodic Change of the Elements of the Force of Terrestrial Magnetism 



discovered by Professor Hoenstein 21 



IV. Corrections to the Computed Lengths of Waves of Light published in the 



Philosophical Transactions of the year 1868. By Geoege Biddell 

 Aiey, C.B., Astronomer Eoyal 21 



V. Corrections and Additions to the Memoir on the Theory of Beciprocal 



Surfaces, Phil. Trans, vol. clix. (1869). By Prof. Catley, F.R.S. . . 22 



November 23, 1871. 



I. Second Paper on the Numerical Values of e, log e 2, log e 3, log e 5, and 



logg 10 ; also on the Numerical Value of M, the Modulus of the Common 

 System of Logarithms, all to 205 decimals. By William Shanks, 

 Houghton-le-Spring, Durham 27 



II. Second Paper on the Numerical Value of Euler's Constant, and on the Sum- 



mation of the Harmonic Series employed in obtaining such Value. By 

 William Shanks, Houghton-le-Spring, Durham 29 



III. An Experimental Determination of the Velocity of Sound. By E. J. Stone, 



M.A., F.R.S., Astronomer Royal at the Cape of G-ood Hope 34 



IV. On a supposed Alteration in the amount of Astronomical Aberration of 



Light, produced by the passage of the Light through a considerable 

 thickness of Refracting Medium. By Geoege Biddell Aiey, C.B., 

 Astronomer Royal 35 



For continuation of Contents see 4th page of Wrapper. 



