CONTENTS {continued). 



■ March 16, 1882. ' 



PAGE 



I. Sur les Centres des Courbure Principaux cles Surfaces Homofocales du 

 Second Ordre. By Lieut.-Colonel A. Maxnheim, Professor in the 

 Ecole Polytechnique .... ..... 421 



II. Note on the Photographic Spectrum of the Great Nebula in Orion. By 



William Huggins, D.C.L., LL.D., F.E.S 425 



III. On the Disappearance of some Spectral Lines and the Variations of 

 Metallic Spectra due to Mixed Vapours. By G. D. Liyeing, M.A., 

 F.E.S. , Professor of Chemistry, and J. Dewab, M.A., F.E.S. , Jack- 

 sonian Professor, University of Cambridge . ... . . . 428 



March 23, 1882. 



I. On the Constituent of the Atmosphere that Absorbs Eadiant Heat. II. 

 By S. A. Hill, Meteorological Eeporter, North-West Provinces and 

 Oudh . . . . . . . . . '.. . . .435 



II. On the Influence of Coal-dust in Colliery Explosions. No. IV. By W. 



Galloway 437 



March 30, 1882. 



I. On the Development of the Ossicula Auditus in the Higher Mammalia. 

 By Alexandee Feasee, M.B.. &c, Senior Demonstrator of Anatomy, 

 Owens College, Manchester 446 



II. Description of the Fossil Tusk of an extinct Proboscidian Mammal 

 {Notelephas australis, Ow.), from Queensland, Australia. By Pro- 

 fessor Owef, C.B., F.E.S., &c 448 



III. Action of Ethylene Chlorhydrin upon the Bases of the Pyridine Series 



and on Quinoline. By Professor Adolph Wtjbtz, For. Mem. E.S. . 448 



IV. On the Movement of Gas in "Vacuum Discharges." By William 



Spottiswoode, P.E.S., and J. Fletcheb Moulton, F.E.S. . . 453 



List of Presents 455 



The Effects of certain Modifying Influences on the Latent Period of Muscle 

 Contraction. By Geeald F. Yeo, M.D., F.E.C.S., and Theodoee Cash, 

 M.D 462 



JFormulee for sn 8u, cn 8u, dn 8u, in terms of sn u. By Eenest H. Glaishee, 



B.A., Trinity College, Cambridge 480 



