PROCEEDINGS OF 



THE ROYAL SOCIETY. 



VOL. XXX. 



No. 200. 



CONTENTS. 



December 18, 1879. 



PAGE 



I. On the Secular Changes in the Elements of the Orbit of a Satellite 

 revolving about a Tidally Distorted Planet. By Gr. H. Darwtx, E.E.S. 



II. On Buff's Experiments on the Diathermancy of Air. By John 

 Tyndall, P.E.S. 



III. On the Photographic Spectra of Stars. By William Huggixs, 



D. C.L., LL.D., F.E.S 



IV. On a New Method of Spectrum Observation. By J. N. Locxyee. 



E. E.S . . . 



V. Note on the Spectrum of Hydrogen. By J. Noe^iax Locxyee, F.E.S 



VI. On the Capillary Electroscope. By G. Goee, LL.D., E.E.S. 



VII. Chemico-Electric Belations of Metals in Solutions of Salts of Potassium 

 By Gr. GrOEE, LL.D., E.E.S 1 . 



VIII. On the Spontaneous Segmentation of a Liquid Annulus. By A. M 

 "WOETHINGTOIT, M.A. . 



IX. On the Histology of Hydra fused,. By J. T. Jeffeby Paexee, B.Sc 

 Lecturer on Biology in Bedford College, London, and Demonstrator 

 in the Eoyal School of Mines. (Plate 1) 



10 



20 



22 

 31 

 32 



38 



49 



61 



January 8, 1880. 



The Baeeeiax Lectuee — On the Photographic Method of Mapping the 

 Least Eefrangible End of the Solar Spectrum (with a Map of the 

 Solar Spectrum from 7600 to 10750)— By Captain W. de W. Abney, 

 B.E., E.E.S 



For continuation of Contents see 4th page of the Wrapper. 



Price Five Shillings. 



