VI 



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Magnetic Observations in Senegambia. By T. E. Thorpe, F.R.S., and 

 P. L. Gray, B.Sc., Assoc. RC.S 361 



A certain Class of Generating Functions in the Theory of Numbers: 

 By Major P. A. MacMahon, K.A., F.R.S 362 



On the Whirling and Vibration of Shafts. By Stanley Dunkerley, 

 M.Sc., Berkeley Fellow of the Owens College, Manchester 365 



On Plane Cubics. By Charlotte Angas Scott, D.Sc. (Lond.), Professor 

 of Mathematics at Bryn Mawr College, Pennsylvania 370 



Alternate Current Electrolysis. By J. Hopkinson, D.Sc., F.R.S., E. 

 Wilson, and F. Lydall. [Title only] 371 



List of Presents 371 



No. 329. November 30, 1893. 



ANNIVERSARY MEETING. 



Report of Auditors 376 



List of Fellows deceased since last Anniversary 376 



elected 376 



Address of the President 377 



Election of Council and Officers 394 



Financial Statement 396399 



Trust Funds 400404 



Income and Expenditure Account , 405 



Table showing Progress and present State of Society with regard to 

 Fellows 406 



Account of Grants from the Donation Fund 406 



Alternate Current Electrolysis. By J. Hopkinson, D.Sc., F.R.S., E. 

 Wilson, and F. Lydall 407 



The Experimental Proof that the Colours of Certain Lepidopterous 

 Larvae are largely due to modified Plant Pigments derived from 

 Food. By Edward B. Poulton, M.A., F.R.S. [Plates 3 and 4] 417 



No. 330. December 17, 1893. 



The Organogeny of Asterina gibbosa. By E. W. MacBride, B.A., 

 Demonstrator of Animal Morphology to the University of Cambridge 431 



Reptiles from the Elgin Sandstone : Description of two New Genera. 

 By E. T. Newton, F.R.S 436 



A Dynamical Theory of the Electric and Luminiferous Medium. By 

 Joseph Larmor, F.R.S., Fellow of St. John's College, Cambridge 438 



On Copper Electrolysis in Vacuo. By William Gannon, M.A. [Title 

 only] 461 



Note on the Action of Copper Sulphate and Sulphuric Acid on Metallic 

 Copper. By Arthur Schuster, F.R.S. [Title only] 461 



On a Chart of the Svmmetrical Curves of the Three-Bar Motion. By 

 W. Brennand. [Title only] 461 



List of Presents ... 461 



