IV 



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Helium and Argon. Part III. Experiments which show the 

 Inactivity of these Elements. By William Eamsay, Ph.D., F.E.S., 

 and J. Norman Collie, Ph.D., F.E.S.E , 53 



On the Amount of Argon and Helium contained in the Gas from the 

 Bath Springs. By Lord Eayleigh, Sec. E.S 56 



On the Changes produced in Magnetised Iron and Steels by cooling to 

 the Temperature of Liquid Air. By James Dewar, LL.D., F.E.S., 

 Fullerian Professor of Chemistry in the Eoyal Institution of Great 

 Britain, and J. A. Fleming, M.A., D.Sc., F.E.S., Professor of Elec- 

 trical Engineering in University College, London 57 



On the Electrical Eesistivity of Bismuth at the Temperature of Liquid 

 Air. By James Dewar, LL.D., F.E.S., Fullerian Professor of 

 Chemistry in the Eoyal Institution, and J. A. Fleming, M.A., D.Sc., 

 F.E.S., Professor of Electrical Engineering in University College, 

 London 72 



On the Electrical Eesistivity of Pure Mercury at the Temperature of 

 Liquid Air. By James Dewar, LL.D., F.E.S., Fullerian Professor 

 of Chemistry in the Eoyal Institution, and J. A. Fleming, M.A., 

 D.Sc., F.E.S., Professor of Electrical Engineering in University 

 College, London 76 



On the Magnetic Permeability and Hysteresis of Iron at Low Tem- 

 peratures. By J. A. Fleming, M.A., D.Sc., F.E.S., Professor of 

 Electrical Engineering in University College, London, and James 

 Dewar, LL.D., F.E.S., Fullerian Professor of Chemistry in the Eoyal 

 Institution, &c 81 



No. 360. 



Observations on. Atmospheric Electricity at the Kew Observatory. By 

 C. Chree, Sc.D., Superintendent 96 



On the unknown Lines observed in the Spectra of certain Minerals. 

 By J. Norman Lockyer, C.B., F.E.S 133 



The Eelation between the Eefraction of the Elements and their Chemical 

 Equivalents. By J. H. Gladstone, D.Sc., F.E.S 140 



Selective Absorption of Eontgen Eays. By J. A. M'Clelland, M.A., 

 Fellow of the Eoyal University of Ireland' 146 



On the Structure of Metals, its Origin and Changes. By F. Osmond 

 and W. C. Eoberts- Austen, C.B., F.E.S., Professor of Metallurgy, 

 Eoyal College of Science 148 



On the Eelations between the Viscosity (Internal Friction) of Liquids 

 and their Chemical Nature. Part II. By T. E. Thorpe, LL.D., 

 F.E.S., and J. W. Eodger, Assoc. E.C.S .". 152 



On the Determination of Freezing Points. By J. A. Harker, D.Sc 154 



No. 361. 

 Etude des Carbures Metalliques. By Henri Moissan 156 



Complete Freezing-point Curves of Binary Alloys containing Silver or 

 Copper, together with another Metal. By C. T. Heycock, M.A., 

 F.E.S., and F. H. Neville, M.A 160 



