vii 



No. 144.— April 24, 1873. 



Page 



On the Durability and Preservation of Iron Ships, and on Riveted Joints. 

 By Sir William Fairbairn, Bart., F.R.S 259 



On the Employment of Meteorological Statistics in determining the best 

 Course for a Ship whose Sailing Qualities are known. By Francis 

 Galton, F.R.S 263 



May 1, 1873. 



List of Candidates for Election into the Society ". 274 



On the Condensation of a Mixture of Air and Steam upon Cold Surfaces. 

 By Osborne Reynolds, M.A., Fellow of Queen's College, Cambridge, and 

 Professor of Engineering in the Owens College, Manchester 275 



On the direct Synthesis of Ammonia. By W. F. Donkin 281 



On the Effect of Pressure on the Character of the Spectra of Gases. By 

 C. H. Stearn and G. H. Lee 282 



May 8, 1873. 



The Action of Light on the Electrical Resistance of Selenium. By Lieut. 

 Sale,R.E 283 



Researches in Spectrum- Analysis in connexion with the Spectrum of the 

 Sun.— No. II. By J. Norman Lockyer, F.R.S 285 



Contributions to the Study of the Errant Annelides of the Older Palaeozoic 

 Rocks. By H. Alleyne Nicholson, M.D., D.Sc, M.A., Ph.D., F.R.S.E., 

 Professor of Natural History in University College, Toronto 288 



May 15, 1873. 



Determination of the Number of Electrostatic Units in the Electromagnetic 

 Unit made in the Physical Laboratory of Glasgow University. By 

 Dugald M'Kichan, M.A 290 



On Jeypoorite, a Sulph-antimonial Arsenide of Cobalt. By Major W. A. 

 Ross, late Royal Artillery 292 



On a Periodicity of Rainfall in connexion with the Sim-spot Periodicity. 

 By C. Meldrum, Director of the Meteorological Observatory, Mauritius. . 297 



On the Heating of a Disk by rapid Rotation in vacuo. By Balfour Stewart, 

 . M.A., F.R.S., Professor of Natural Philosophy in Owens College, Man- 

 chester, and P. G. Tait, M.A., Professor of Natural Philosophy in the 

 University of Edinburgh 309 



On the Extension of the Numerical Value of n. By William Shanks .... 318 



List of Presents 



320 



