xii REPORT — 1902. 



Page 



3. The Longitudinal Stability of Aerial Gliders. By Professor G. H. 

 Beyan, Sc.D., F.R.S 624 



4. On Map-colouring. By Professor A. 0. Dixon, Sc.D 525 



6. On the Newtonian Potential. By Professor A. C. Dixon, Sc.D 526 



6. The Discriminant of a Family of Curves or Surfaces. Bv Professor 

 Beomwich, M.A., and R. W. H. T. Hudson, M.A ' 526 



7. Matrix Notation in the Theory of Screws. By R. AV. H. T. Hudson, M.A. 528 



8. On Pluperfect Numbers. By Lieut.-Colouel Allan Cunningham, R.E. 528 



9. *0n a Practical Rule for finding the Perimeter of an Ellipse. Bv Thomas 

 MuiE, C.M.G , F.R.S ." 629 



JO. The late J. Hamblin Smith's Rule for the Decimalisation of English 



Money. By J. D. Hamilton Diceson 529 



11. *A Theorem in Determinants. By A. A. Robb 530 



Depaetment II. — Physics. 



1. Note on the Variation of the Specific Heat of Mercury with Tempera- 

 ture : Experiments by the Continuous-flow Method of Calorinietry. By 

 HowAED T. Baenes, M.A.Sc, D.Sc, and H. Lestee Cooke, B.A 530 



2. Some Experiments on Radiation and Absorption : a Preliminary Study 



for a Staudard of Light. By J. E. Petatel 534 



3. Some Observations on Equations of State. By H. H. F. Hyndman 535 



4. *0n the Graphical Representation of Ramsay aud Young's Law for the 



Comparison of Vapours at Equal Pressures. By Professor J. D. 

 Eteeett, F.R.S 537 



5. Dependence of Pitch of Minute Closed Pipes on Wind Pressure. By 



C. S. Myees, M.D 537 



6. A Lens for Ultra-violet Therapy. By J. William Giffokd 537 



7. Mr. Petavel's Recording Gauge applied to Ordnance and Small Anns, 



By Captain J. Beuce-Kingsmill, R.A 638 



8. On an Improvement upon Huygens' Construction. By G. Johnstone 



Stoney, M.A., D.Sc, F.R.S....'. 539 



9. How to apply the Resolution of Light into Undulations of Flat Wavelets 

 to the Investigation of Optical Phenomena. Bv G. Johnstone Stoney, 

 M.A., D.Sc, F.R.S " 539 



Department III. — Asteonomy and Cosmical Physics, 



1. *Illustratious obtained by Photographv of the Evolution of Stellar 



Systems. By Isaac Roberts, D.Sc F.R.S 541 



2. Radiation in Meteorology. By W. N. Shaw, D.Sc, F.R.S 541 



3. On the Figure of the Earth. By Major S. G. Burraed, R.E 541 



4. Report on Seismological Investigations (p. 59) 542 



5. Report on the Investigation of the Upper Atmosphere by Means of 

 Kites (p. 77) 542 



6. Report on Magnetic Observations at Falmouth Observatory (p. 75) 542 



7. Report on Meteorological Observations on Ben Nevis (p. 93) 543 



8. Report on the Comparison and Reduction of Magnetic Observations 



(P-68) 543 



