550 Index. 



New all, H. F., On the marks made by stars on photographic plates near the 

 focus of a telescope, 269. 



On luminosity attending the compression of certain rarefied gases, 295. 



On the Total Eclipse of the Sun, 1898 Jan. 22, 521. 



Origin of Vertebrates (Gaskell), 19. 



Orr, W. M c F., Theorems on the contacts of spheres, 271. 



On the interpretation of divergent solutions of the hypergeometric 



equation, 531. 

 Osmometer (Dr Lazarus Barlow), 72. 

 Osmotic pressure, On the theory of (Larmor), 240. 



Parkin, J., Elected Fellow, 1896, Feb. 24, 97. 

 Peripatus novee britanniae, On the development of (Willey), 530. 

 Perkins, R. C. L., Notes on some Hawaiian Insects. 373. 

 Pertz, Miss D. F. M., and Mr F. Darwin, Injection of intercellular spaces 

 in leaves of Elodea during recovery from plasmolysis, 272. 



Effects of water currents on assimilation of aquatic plants, 76. 



Phosphorescence in gases (Newall), 295. 



Photographic plate, Effect of zinc and other metals on a (Thomson), 372. 



Figures produced by electric discharges on (M c Clelland), 522. 



Platinum Thermometry, On a method of facilitating (Wade), 526. 

 Pocklington, H. C, Electrical oscillations in wires, 324. 



Polyzoa, Cyclostomatous (Harmer), 208. 



Precession, On the period of the earth's Free Eulerian (Larmor), 183. 



Prism, Absolute minimum of deviation through a (Larmor), 108. 



Maximum deviation of a ray of light through a (Anderson), 195. 



Quinqueloculine arrangement (Lister), 236. 



Ramsey, A. S., Elected Fellow, 1898, Feb. 7, 398. 



Reynolds Green, Dr J., Elected Fellow, 1896, Feb. 24, 97. 



Robson, H. C, Elected Fellow, 1897, Feb. 22, 258. 



Rontgen Rays, Longitudinal Electric Waves and (Thomson, J. J.), 49. 



Leakage through dielectrics traversed by (Thomson, J. J., and 



M c Clelland, J. A.), 126. 

 ■ On the nature of (Stokes), 215. 



On the diffuse reflection of (Thomson), 393. 



Photographs of metallic alloys (Heycock and Neville), 417. 



Rutherford, E., The discharge of electrification by ultra-violet light, 401. 



Scott, A., On the atomic weight of oxygen, 143. 



On the combining volumes of carbon monoxide and oxygen, 144. 



