— CCXl — 



Absoliite Dcnsily di' a Gas. — Uayh'.ìrjìi. On the Tonsion of 

 Water Surfaces, Clean and Contamined, investigated by the 

 Melliod of Hippies. — Spencev Unifrcville Pickering. The 

 Expansion of Water and otlier Liquids. — Orme Musson. On 

 tlie Relation between the Bolling-Points, Molecular Voluines, 

 and Chemical Characters of Liquids. — Sydney Yvung. On 

 the Relation between the Boiling-poinls, Molecular Volumcs, 

 and Chemical Characters of Liquids. — /. Bridge. On the 

 Measurement of Astigmatism and some otlier Ocular Defects. 



— W. J. Cooper. Notes on Hydrogen Gas, 



London {The), Edinburgh and Duhlin Philosophical Ma- 

 gazine and Journal of Science. - Voi. 30, 187. - 

 London, december 1890. 



Andrew Gray. On the Dynamical Theory of Electrouiagnetic Action. 



— Rayleigli. On the Theory of Suiface Forces. — G. H. Bryan. 

 On the Deformation of Twisted Strips. — J. Trowbridge. Mo- 

 lion of Atoms in Electric Discharges. — G. Gore. The Grea- 

 ter Inlìuence of First Quantities of Electrolytes on Volta-Elec- 

 tromotive Force. — A. Gray. On the Magneto-Optical Gene- 

 lation of Elcctricity. — Werner v. Sienietis. On the General 

 System of Winds on the Eart. 



/(/. - Voi. 31, n. 188. - Januaiy 1891. 



J. H. Gladstoue and G. Gladslone. The Refraction and Dispersion 

 of Fluorbeiize and allied compounds. — C. liarus. The Chemi- 

 cal Equilibriiim of Solids, in its Relations to Pressure and to 

 Temperature. — W. Ellis. On Ihe Diurnal Variations of Ma- 

 gnetic Eleiiients, as depending on the Method of Tabul.ition. 



— /. H. Gladstone and W. Hibbert. Additional Notes on Se- 

 condary Batteries. — C. V. Boys and A. E. Briscoe. On the 

 Measurement of Electromagnctic Radiation. — F, J, Smith. 

 The Measurement of the Time of the Fall of Magnetization in 

 a Magnetized Iron Cylinder. 



/(/. - Voi. 31, n. 189. - February 1891. 



.■1. Schmtcr. Tiio Elomcntary Treatment of Problems on tlie Dif- 

 fraction of Light. — Rayleiyh. On Pin-holo Photograpliv. — 



