38 Messrs Sewurd and Hill, On Lepidodendron, etc. [Nov. 14, 



(3) On Lepidodendron from the Calciferous Sandstone of 

 Scotland. By Mr A. C. Seward and A. W. Hill, B.A., King's 

 College. 



(Abstract.) 



A description was given of the anatomy of an unusually well- 

 preserved stem of Lepidodendron Wunschianum recently found in 

 a railway cutting at Dalmeny in Linlithgowshire. The material 

 was generously placed in Mr Seward's hands by Mr Kidston of 

 Stirling, and a large polished section of the fossil has been added 

 to the Museum of Practical Geology, Jermyn Street. This species 

 of Lepidodendron was originally described by Carruthers and after- 

 wards by Williamson from specimens found in the volcanic rocks 

 of Arran, but the Dalmeny stem is much more perfect and exhibits 

 some important features which have not been previously observed. 

 The stem measures nearly 40 cm. in diameter, the outer bark is 

 well preserved, but the more delicate middle cortex was destroyed 

 before petrifaction ; the innermost cortex and the central cylinder 

 show remarkably perfect structure. One of the important 

 characters noticed in the stem was the structure of the leaf-trace 

 bundles; these consist of a small strand of xylem more or less 

 completely surrounded by radially disposed rows of secondary 

 elements. The presence of numerous secretory canals in the 

 outer cortex or phelloderm was also referred to as a feature of 

 some interest. 



Monday, 28 November, 1898. 

 Mr J. Larmor, President, in the Chair. 



The following were elected Fellows of the Society : 



W. Welsh, M.A., Jesus College. 



W. M C F. Orr, M.A., St John's College. 



G. T. Walker, M.A., Trinity College. 



J. Graham-Kerr, B.A., Christ's College. 



J. H. Grace, B.A., Peterhouse. 



E. W. Barnes, B.A., Trinity College. 



The following communications were made to the Society : — 



(1) On the Flame-spectrum of Mercury, and its bearing on 

 the distribution of energy in gases. By Professor Liveing. 



Hitherto, I believe, no flame-spectrum of mercury has been 

 described, though that metal gives a spectrum of very brilliant 

 rays when it is one of the electrodes of a spark discharge ; and 

 some years ago Prof. Dewar and I observed a very strong, diffuse, 

 and easily reversed ray, with wave-length 2535'8, when mercury 



