CONTENTS. 



VOL. XLII. 



No. 251. — January 6, 1887. 



l'age 



On the Occurrence of Silver in Volcanic Ash from the Eruption of 

 Cotopaxi of July 22nd and 23rd, 1885. By J. W. Mallet, M.D., F.R.S., 

 University of Virginia 1 



Preliminary Note on the Continuity of the Liquid and Gaseous States of 

 Matter. By William Ramsay, Ph.D., and Sydney Young, D.Sc 3 



Note on Lepidodendron Harcourtii and L. fuliginosum, Will. By W. C. 

 Williamson, LL.D., F.R.S., Professor of Botany in the Owens College 

 and in the Victoria University 6 



On the Organisation of the Fossil Plants of the Coal-measures : Heteran- 

 gium Tiliceoides, Will., and Kaloxylon Hookeri. By Professor W. C. 

 Williamson, LL.D., F.R.S., Professor of Botan}*- in the Owens College 

 and in the Victoria University 8 



List of Presents 10 



January 13, 1887. 



Supplementary Note on Polacanthus Foxii, describing the Dorsal and 

 some parts of the Endoskeleton imperfectly known in 1881. By J. W. 

 Hulke, F.R.S 16 



The Reputed Suicide of Scorpions. By Alfred G. Bourne, D.Sc, Fellow 

 of University College, London, and Professor of Biology in the 

 Presidency College, Madras 17 



Supplementary Note on the Values of the Napierian Logarithms of 2, 3, 

 5, 7, and 10, and of the Modulus of Common Logarithms. By Pro- 

 fessor J. C. Adams, M.A., F.R.S 22 



On the Crimson Line of Phosphorescent Alumina. By William Crookes, 

 F.R.S., V.P.C.S 25 



List of Presents 31 



