VI 



No. 262.— January 12, 1888. 



Page 



Pieliixinary Note on the Nephridia of Ferichaeta. By Frank E. Beddard, 

 M.A., Prosector to the Zoological Society of London, Lecturer on 

 Biology at Guy's Hospital 309 



invariants, Co variants, and Quotient Derivatives associated with Linear 

 , Differential Equations. By A. E. Forsyth, M.A., F.RS., Fellow of 

 Trinity College, Cambridge 311 



List of Presents 317 



January 19, 1888. 



Notes on the Spectrum of the Aurora. By J. Norman Lockyer, F.RS.. 320 



On the Secondary Carpals, Metacarpals, and Digital Eays in the Wings 

 of existing Carinate Birds. By W. K. Parker, F.RS 322 



List of Presents 325 



January 26, 1888. 



The Emigration of Amoeboid Corpuscles in the Startish. By Herbert 

 E. Durham, B.A., latelv Vintner Exhibitioner, King's College, Cam- 

 bridge (Plate 3)' 327 



Note on the Madreporite of Cribrella ocellata. By Herbert E. 

 Durham, B.A., lately Yintner Exhibitioner, King's College, Cam- 

 bridge ! 330 



Eeport on Hygrometric Methods. First Part, including the Saturation 

 Method and the Chemical Method, and Dew-point Instruments. By 

 W. N. Shaw, M.A 333 



List of Presents 336 



No. |63.— February 2, 1888. 



On Tidal Currents in the Ocean. By J. Y. Buchanan, M.A., F.E.S.E. 340 



On the Spectrum of the Oxyhydrogen Flame. By G. D. Liveing, 

 M.A., F.E.S., Professor of Chemistry, and J. Dewar, M.A., F.E.S., 

 Jacksonian Professor, University of Cambridge 347 



On the Yoltaic Circles producible by the Mutual Neutralisation of Acid 

 and Alkaline Fluids, and on various related Forms of Electromotors. 

 By C. R Alder Wright, D.Sc, F.E.S., Lecturer on Chemistry and 

 Physics, and C. Thompson, F.I.C., F.C.S., Demonstrator of Chemistry, 

 in St. Mary's Hospital Medical School 348 



List of Presents 348 



February 9, 1888. 



The Small Free Vibrations and Deformation of a Thin Elastic Shell. By 

 A. E. H. Love, B.A., Fellow of St. John's College, Cambridge 352 



