32 PROCEEDINGS OF SECTION A. 



9.— AN INDUCTIVE METHOD OF DERIVING CERTAIN MATHEMA- 

 TICAL FORMULA. 

 By H. TOMKYS. 



10.— A DIRECT METHOD OF ESTABLISHING THE CONVERSE OF 

 A PROPOSITION. 



By H. TOMKYS. 



IL— THE GEOGRAPHICAL POSITION, CHARACTER, AND CONTOUR 

 OF ANTICYCLONES AS AN INDICATION OF COMING WEATHER. 



By H. A. HUNT, F.R.Met.Soc. 



12.— THE TRILINEAR GEOMETRY OF THE COMPLETE QUADRILA- 

 TERAL. 



By E. G. HOGG, M. A. 



13.— ON A SYSTEM OF RELATED TRIANGLES. 

 By E. G. HOGG, M.A. 



14.— THE SCATTERING OF CATHODE RAYS. 

 By J. P. V. MADSEN, B.E., D.Sc. 



15.— NOTE ON THE THEORY OF THE ELECTRODELESS 

 DISCHARGE. 



By PROFESSOR POLLOCK, BE., D.Sc. 



16.— THE NATURE OF THE LIGHT EFFECT IN SELENIUM. 

 By O. U. VONWILLER, BSc 



17.— BRIEF NOTE ON THE NEW MAINKA SEISMOMETER AT 

 RIVERVIEW COLLEGE, SYDNEY. 



By Rev. E. F. PIGOT, S.J.,B.A., MB. 



18.— STANDARD ASTRONOMY, ITS PRESENT POSITION AND 

 FUTURE PROSPECTS. 

 By W. E. COOKE, M.A., F.R.A.S. 



19.— ON THE SCATTERING OF SOUND WAVES BY A SOLID CONE. 

 By PROFESSOR CARSLAW, M.A., D.Sc, F.R.S.E. 



