PROCEEDINGS OF 

 THE ROYAL SOCIETY. 



VOL. XLIIT. fftjO Q * No. 262. 



^ FIB 2 1 \m 



CONTENTS. 



January 12, 1888. 



PAGE 



I. Preliminary Note on the Nephridia of jPerichatta. By Frank E. 

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

 on Biology at Guy's Hospital ........ 309 



II. Invariants, Covariants, and Quotient Derivatives associated with Linear 

 Differential Equations. By A. R. Forsyth, M.A., F.R.S., Fellow of 

 Trinity College, Cambridge . . 311 



List of Presents ............ 317 



January 19, 1888. 



I. Notes on the Spectrum of the Aurora. By J. Norman Lockyer, F.R.S. 320 



II. On the Secondary Carpals, Metacarpals, and Digital Rays in the Wings 



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



List of Presents ............ 325 



January 26, 1888. 



I. The Emigration of Amoeboid Corpuscles in the Starfish. By Herbee r 

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

 bridge (Plate 3) . 327 



II. Note on the Madreporite of CribreUa ocellata. By Herbert E. 



Durham, B.A., lately Yintner Exhibitioner, King's College, Cambridge 330 



III. Report 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 



Price One Shilling and Sixpence, 



