XVlll 



Prof. W. P. Barrett, f.r.s.e. — Notes from the Physical Laboratory of 

 the Royal College of Science : 



No. 1. — " On the cause of the vibration in the Trevelyan 



Rocker." 

 No. 2. — " On the effect of Temperature on the Illuminating 

 Power of Coal Gas." 

 G. Johnstone Stoney, d.sc, f.r.s. — " On a New Harmonic Relation 



between the Lines of Hydrogen." 

 RejDort on the Progress of Science. — Dr. J, Stoney, f.r.s. — "On Dr. 

 Hnggin's discovery of a Group of Spectral Lines characteristic of Wlirfce 

 Stars." 



Section II. — Natural Science. 



(With which the " Royal Geological Society of Ireland " is 

 associated.) 



G. H. KiNAHAN, M.R.I.A., President Royal Geological Society of 

 Ireland, in the Chair. 



The following Communications were laid before the Section: — 



" Anniversary Address by the President of the Royal Geological Society 

 of Ireland (1880.)" 



(Proceedings, Vol. TL, N.S.) 



y. Ball, m.a., f.g.s. — " On the evidence in favour of the existence of 

 Floating Ice in India, during the deposition of the Talchir (Permian) 

 Rocks." 



(Proceedings. YoL II., N.S.) 



Monday Evening, Maech 15th, 1880. 



Sections I. and III. — Physical and Experimental Science, 



and Applied Science. 



(With which the " Dublin Scientific Club " is associated.) 



Professor Baerett, f.e.s.e., in the Chair. 



The following Communications were laid before the Section : — 



J. L. E. Dreyer, M.A., F.R.A.s. — " A Record of the Progress of 



Astronomy during the year 1879." 

 (Proceedings, Yol. II., N.S.) 

 G. Johnstone Stoney, d.sc, f.r.s. — " Note on Maxwell's Theory of 



Stresses in Rarified Gases." 

 G. Johnstone Stoney, d.sc, f.r.s. — "A simple Formula for the 



volume of Gas produced by a chemical reaction." 

 S. Hunter, f.r.a.s. — " On the absence of the Lunar Atmosphere, the 



origin of Saturn's Nebulary Ring, and the Zodiacal Light." 

 Arthur E. Porte — Exhibited a Telephone Exchange at work. 



