Vll 



No. 168.— March 2, 1876. 



Page 



List of Candidates for Election into the Society 345 



The Organ of Corti in Mammals. By Urban Pritchard, M.D., F.R.C.S., 

 Lecturer on Physiology (Evening Classes), King's College, London, Sur- 

 geon to the Eoyal Ear Dispensary 346 



Preliminary Note on the Compound Nature of the Line-Spectra of Elemen- 

 tary Bodies. By J. N. Lockyer, F.R.S 352 



On the Influence of Coal-dust in Colliery Explosions. By W. Galloway. . 354 



March 9, 1876. 



On the Diurnal Variations of the Disturbances of the Magnetic Declination 

 at Lisbon. By J. Capello, Director of the Lisbon Observatory 373 



On the Development of the Crustacean Embryo, and the Variations of form 

 exhibited in the Larvae of 38 Genera of Podophthalmia. By C. Spence 

 Bate, F.R.S 375 



On a Secular Variation in th e Rainfall in connexion with the Secular Vari- 

 ation in amount of Sun-spots. By Charles Meldrum, M.A., Director of 

 the Mauritius Observatory 379 



March 16, 1876. 

 ' Challenger ' Reports. (See No. 170.) 387, 388 



March 23, 1876. 



On the Force caused by the Communication of Heat between a Surface and 

 a Gas, and on a New Photometer. By Prof. Osborne Reynolds 388 



On the Nature of the Force producing the Motion of a Body exposed to 

 Rays of Heat and Light. By Arthur Schuster, Ph.D., Demonstrator in 

 the Physical Laboratory of Owens College 391 



On the Number of Figures in the Period of each Reciprocal of a Prime from 



53,000 to 60,000. By W. Shanks 392 



On a new Refractometer for measuring the Mean Refractive Index of Plates 

 of Glass and Lenses by the employment of Newton's Rings. By G. W. 

 Royston-Pigott, M.A., M.D. Cantab., F.R.S., F.R.A.S., F.O.P.S 393 



Description of a Mammalian Ovum in an early condition of Development. 

 . By Edward Albert Schafer, Assistant Professor of Physiology in Univer- 

 sity College, London. (Plate 10.) 399 



< Challenger ' Report. (See No. 170) 403 



