II. " On an Instrument for the Measurement of the Length of 

 Long Electric Waves, and also Small Inductances and 

 Capacities." By Professor J. A. FLEMING, F.R.S. 



III. "Report on an Area of Local Magnetic Disturbance in East 



Loch Roag, Lewes, Hebrides." By Captain A. M. FIELD, 

 R.N. Communicated by Rear- Admiral Sir WILLIAM 

 WHARTON, K.C.B., F.R.S. 



IV. "Phosphorescence caused by the Beta and Gamma Rays of 



Radium." By G. T. BEILBY. Communicated by Professor 

 J. LARMOR, Secretary, R.S. 



V. " The Spectrum of Scandium and its Relation to Celestial 

 Spectra." By Sir NORMAN LOCKYER, K.C.B., F.R.S., and 

 F. E. BAXANDALL. 



VI. " On the Stellar Line near A 4686." By Sir NORMAN LOCKYER, 

 K.C.B., F.R.S., and F. E. BAXANDALL. 



VII. "Note on the Spectrum of ju- Centauri." By Sir NORMAN 

 LOCKYER, K.C.B., F.R.S., and F. E. BAXANDALL. 



VIII. " Europium and its Ultra- Violet Spectrum." By Sir WILLIAM 

 CROOKES, F.R.S. 



February 16, 1905. 

 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. " Polarised Rontgen Radiation." By Dr. C. G. BARKLA. Com- 

 municated by Professor J. J. THOMSON, F.R.S. 



II. " The Effects of Momentary Stresses in Metals." By Professor 

 B. HOPKINSON. Communicated by Professor J. A. EWING, 

 F.R.S. 



III. " The Halogen Hydrides as Conducting Solvents. Parts I to IV." 



By B. D. STEELE, D. MC!NTOSH, and E. H. ARCHIBALD. 



IV. " Further Observations on Slip-bands. Preliminary Note." By 



W. ROSENHAIN. Communicated by Professor J. A. EWING, 

 F.R.S. 



