CONTENTS. XI 



MONDAY, SEPTEMBER l4. 



Depaetment of Mathematics, 



Page 



1. On the Differential Invariants of Surfaces and of Space. By Professor 



A. R. Forsyth, F.R.S 559 



2. On Spherical Curves. By Harold Hilton, M.A 559 



3. The Use of Tangential Co-ordinates. By R. W. H. T. Hudson 560 



4. *The Determination of Successive High Primes. By Lieut. -Colonel A. 



Cunningham, R.E., and H. J. Woodall 561 



5. Algebraic Curves on Kummer's 16-nodal Quartic Surface. By R. W. PI. 



T. Hudson 561 



Sub-section — Astronomy and Meteorology. 



1. *Emploie de ITIygrometre a Cheveu au lieu du Psychrometre. By 

 Hofrath J. M. Pernter 561 



2. Was the ' New ' Star in Gemini shining previously as a very Faint Star ? 



By Professor H. H. Turner, D.Sc, F.R.S. 562 



3. Sur la Circulation generale de I'Atmosphere. Par H. H. Hilde- 



BRANDSSON 562 



4. Report on the Investigation of the Upper Atmosphere by means of Kites 



(p. 31) 565 



5. Results of the Exploration of the Air with Kites at Blue Hill Observatory, 



Mass., U.S.A., during 1900-2, and the Use of this Method on the 

 Tropical Oceans. By A. Lawrence Rotch, B.S., M. A 565 



6. Work of the International Aeronautical Committee. Bj' Professor H. 

 Herg esell 566 



7. Photographs of the Orion Nebula. By W. E. Wilson, F.R.S 567 



8. Lightning and its Spectra. By W. J. S. Loceyee, M.A., Ph.D., F.R.A.S. 567 



9. On the Phenomena accompanying the Volcanic Eruptions in the West 

 Indies. By David Burns 667 



TUESDAY, SEPTEMBER 15. 

 Department of Mathematics .vnd Physics. 



1. Report of the Committee on Electrical Standards (p. 33) 568 



2. Note on Carbon and Iron Arc Spectra at High Gaseous Pressures. By 



R. S. HuTTON and J. E. Petavel , 568 



3. How to Exhibit in Optical Instruments the Resolution of Light into its 



Component Undulations of Flat Wavelets, and how to Employ this 

 Resolution as our Guide in Making and in Interpreting Experiments. 

 By G. Johnstone Stoney, M.A, Hon.Sc.D., F.R.S 568 



4. On the Form of Lagrange's Eq^uations for Non-Holonomic Systems. 



By Professor Ludavig Boltzmann 569 



5. *Wave-propagation in a Dispersive Medium. By Professor A. Schuster, 

 F.R.S 569 



6. Discussion on the Use of Vectorial Methods in Physics. Opened by 



Professor O. Hesrici, F.R.S. (p. 51) .'. 569 



Contribution to the Discussion on Vectors. By James Swinburne, 

 M.Inst.C.E 569 



