TRANSACTIONS OF THE SECTIONS. 



Section A.— MATHEMATICAL AND PHYSICAL SCIENCE. 



THURSDAY, SEPTEMBER 2. 



Page 

 Address by Professor G. 11. Darwin, M.A., LL.D., F.E.S., F.R.A.S., Presi- 

 dent of the Section 511 



1. Communication from the Grenada Eclipse Expedition. By Donald 

 MacAlistee, M.A., M.D., B.Sc 518 



2. First Report on our Experimental Knowledge of the Properties of Matter. 



By P. T. Main, M.A 518 



3. On the Critical Mean Curvature of Liquid Surfaces of Pievolution. By 

 Professor A. W. Ruckee, M.A., F.R.S 518 



4. A Mercurial Air-pump. By J. T. Botiojilet, M.A., F.E.S.E 519 



5. On the Cutting of Polarising Prisms. By Professor Siltanus P. Thomp- 

 son, D.Sc 520 



6. On a Varying Cylindrical Lens. By Tempest Anderson, M.D., B.Sc. ... 520 



7. On the Law of the Propagation of Light. Bv Professor J. II. Potkting, 

 M.A., and E.F. J. Love, B.A ." 521 



8. On a new form of Current-weigher for the Absolute Determination of the 

 Strength of an Electric Current. By Professor James Bltth 521 



9. On the Proof by Cavendish's Method that Electrical Action varies inversely 



as the Square of the Distance. By Professor J. H. Potnting, M.A 523 



10. On the Electrolysis of Silver and Copper, and its Application to the 

 Standardising of Electric Current- and Potential-Meters. By Thomas 

 Geat, B.Sc, F.R.S.E 524 



11. Description of a new Calorimeter for lecture purposes. By T. J. Baker 525 



FRIDAY, SEPTEMBER 3. 



1. On the Physical and Phvsiological Theories of Colour- Vision. By Lord 

 Ratleigh, D.C.L., LL.b., Sec.R.S 526 



2. The Modern Development of Thomas Young's Theory of Colour-vision. 



By Dr. Arthur Konig 526 



3. On the Physical and Physiological Theories of Colour-vision. By Pro- 

 fessor Michael Foster, M.D., Sec.R.S 526 



4. On Hering's and Young's Theories of Colour-vision. By John Tennant 526 



5. Second Report of the Committee on Standards of Light 527 



6. Thermopile and Galvanometer combined. By Professor George Forbes 527 



