Vlll 



March 20, 1879. 



Page 



Note on some Spectral Phenomena observed in the Arc produced by a 

 Siemens' Machine. By J. Norman Lockyer, F.R.S 425 



Note on some Phenomena attending the Eeversal of Lines. By J. 

 Norman Lockyer, F.K.S 428 



Discussion of Young's List of Chromospheric Lines. (Note I.) By 

 J. Norman Lockyer, F.B.S. (Plate 9) 432 



March 27, 1879. 



On the Organization of the Fossil Plants of the Coal Measures. Part X. 

 By W. C. Williamson, F.B.S., Professor of Natural History in Owens 

 College, Manchester 445 



Observations on the Physiology and Histology of Convoluta Schultzii. 

 By P. Geddes 449 



List of Presents 457 



No. 195.— April 3, 1879. 



On the Thermal Conductivity of Water. By J. T. Bottomley, Lecturer 

 in Natural Philosophy and Demonstrator in Experimental Physics in 

 the University of Glasgow 462 



The Preparation in a State of Purity of the Group of Metals known as 

 the Platinum Series, and Notes upon the manufacture of Iridio- 

 Platinum. By George Matthey 463 



On the Reversal of the Lines of Metallic Vapours. No. VI. By G. D. 

 Liveing, M.A., Professor of Chemistry, and J. Dewar, M.A., F.RS., 

 Jacksonian Professor, University of Cambridge 471 



Note of the unknown Chromospheric Substance of Young. By G. D. 

 Liveing, M.A., Professor of Chemistry, and J. Dewar, M.A., F.R.S., 

 Jacksonian Professor, University of Cambridge 475 



Contributions to Molecular Phvsics in High Vacua. By William 

 Crookes, F.B.S 477 



Note on a Direct Vision Spectroscope after Thollon's Plan, adapted to 

 Laboratory use, and capable of giving exact Measurements. By G. D. 

 Liveing, M.A., Professor of Chemistry, and J. Dewar, M.A., F.E.S., 

 Jacksonian Professor, University of Cambridge 482 



April 24, 1879. 



On the nature of the Fur on the Tongue. By Henry Trentham Butlin, 

 F.R.C.S. (Plates 10—13) 484 



Note on the Supplementary Forces concerned in the Abdominal Circula- 

 tion in Man. By J. Braxton Hicks, M.D., F.R.S 489 



