IV 



PROCEEDINGS OF THE SECTIONS. 

 Section A. 



Astronomy, Physics, Mathematics, and Mechanics. 



President of Section — Professor W. H. Bragg, M.A., University 

 of Adelaide. 



Page 



1. The Astronomical Explanation of a Glacial Period. By Sir 



RoBEKT Ball, Astronomer Royal for Ireland 250 



2. The Conductivity of Solutions of Copper Sulphate. By W. H. 



Steele 256 



3. A Property of Algebraic Curves. By J. H. Mitchell. (Abstract). 257- 



4. Tasmanian Earth Tremors. By A. B. Biggs, Launceston, 



Tasmania. (Abstract) 258 



5. The Bilging- of Flat Plates. By J. H. Mitchell. (Abstract)... 258 



6. On some difficulties arising in the Photographic Charting of the 



Heavens. By R. L. J. Ellery, F.R.S., F.R.A.S., Government 

 Astronomer, Melbourne. (Abstract). .. 260 



7. The Dodging Tide of South Australia. By R. W. Chapman, 



M.A., B.C.E 261 



8. Solar Phenomena and their Effects. By The Archbishop of 



HOBART 261 



9. The Grouping of the Stars in the Southern Part of the Milky 



Way. By H. C. Russell, B.A., C.M.G., F.R.S., Government 

 Astronomer, Sydney, New South Wales 261 



10. Remarks on the desirability of establishing Tidal Observations in 



Tasmania. By R. L. J. Ellery, F.R.S., F.R.A.S., Government 

 Astronomer, Victoria 261 



11. Uniiication of Standard Weights and Measures. By R. B. 



Lucas 261 



12. A Method of determining Longitude at Sea. By Captain Shortt, 



R.N., Government Meteorologist, Hobart, Tasmania 261 



13. The Science of the Unseen. By Archdeacon Hales, Launceston. 261 



14. A Graphic Method of showing the Relation between the Tempera- 



ture of the Dew Point and Temperature of the Air for any given 

 Climate. By C. W. Adams, Chief Surveyor, Dunedin, New 

 Zealand. (Abstract) 261 



15. Quaternions as an Instrument of Physical Research. By A. 



M'Aulay, M.A., Ormond College, Melboui'ne. 



?.;>( Section B. 



Chemistry and Mineralogfy. 



President of Section— W. M. Hamlet, F.C.S., F.I.C. Government Analyst, 

 Sydney, New South Wales. 



1. The Oleo-Refractometer in Organic Analysis. By W. M. Hamlet, 



F.I.C, F.C.S 262 



.2., Note on the Volatility of Magnesium. By J. B. Kirkland, 

 F.C.S., Assistant Lecturer and Demonstrator of Chemistry, 

 ; . University Melbourne 263 



3. Note on the Electrolysis of the Salts of Organic Bases. By J. B. 



Kirkland, F.C.S 264 



4. Lecture Experiment on Gaseous Diffusion. By J. B. Kirkland, 



F.C.S 265 



