TRANSACTIONS OF THE SECTIONS. siii 



Department of Cosmicai, Physics (Astronomy). 



Page 



1. Report of the Seismological Committee (p. 56) 602 



2. A Generalised Instrument. By Sir Robert Ball, F.R.S 602 



3. A New Form of Divided Object Glass Telescope. By Sir Howard 



Grubb, F.R.S 603 



4. The New Spectroheliograph for the Madrid Observatory. By Sir 



Howard Grtjbb, F.R.S 603 



5. On the Relation between Intensity of Light, Time of Exposure, and 



Photographic Action. By Profes5or H. H. Turner, D.Sc, F.R.S. . . 604 



6. Systematic Motion of the Stars. By Professor F. W. Dysok, F.R.S.. . 604 



7. The Reflecting Telescope and its Suitabihty for Physical Research. 



By Sir Howard Grtjeb, F.R.S , . , . , 005 



3I0NDAY, SEPTEMBER 7. 



Discussion on the Theory of Wave-motion, opened by Professor Horace 

 Lamb, F.R.S 603 



Department of Mathe.matics. 



1. Linear Vector Functions. By Sir Robert Ball, F.R.S 611 



2. The Inductance of Two Parallel Wires. By J. W. Nicholson, D.Sc. 



BA .'612 



3. On the Ether Stress of Gravitation. By Professor F. PtXRgEa, F.T.C.D. 613 



4. Conservative Systems of Prescribed Trajectories. By Professor E. 



Odell Lovett gl4 



5. Factorisation of the A.P.F. of N=(i/''Tl). By Liout.-Colonel Allan 



Cunningham, R.E , 615 



6. An Elementary Discussion of Schlafli's Double-six. By Professor A. C 



Dixon, Sc.D., F.R.S 616 



7. On the Logarithmic Case in Linear Differential Equations. * By Pro- 



fessor A. C. Dixon, Sc.D., F.R.S 617 



Department of General Physics. 



1. A New Three-Colour Camera. By Sir W. db W. Abney, K.C.B 



F.R.S 618 



2. On the Measurement of Large Inductances containing Iron. By 



Sir Oliver Lodge, F.R.S., and Benjamin Davies 620 



3. A Remarkable Feature in the Splash of a Rough Sphere. By Pro- 



fessor A. M. Worthington, C.B., F.R.S 621 



4. Analogy between Absorption from Solutions and Aqueous Condensation 



on Surfaces. By Professor F. T. Trouton, D.Sc, F.R.S 621 



5. On the Effect of Pressure on the Boiling-point of Sulphur. By Dr. J. A. 



Harker and F. P. Sexton 621 



6. On the Photometric Standard of the National Physical Laboratory. 



By Dr. R. T. Glazebrook. F.R.S 623 



7. An Improved Dry Daniell Pile. By John Brown, F.R.S 623 



