XVill 
Prof. W. F. 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.” 
Report on the Progress of Science.—Dr. J. Stoney, F.R.s.—‘ On Dr. 
Huggin’s discovery of a Group of Spectral Lines eharacteristic of White 
Stars.” 
Section IT.—Natural Science. 
(With which the ‘‘ Royal Geological Society of Ireland” is 
associated. ) 
G. H. KINAHAN, M.B.LA., 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. IT., N.S.) 
V. BALL, M.A., F.G.8.— On the evidence in favour of the existence of 
Floating Ice in India, during the deposition of the Talchir (Permian) 
Rocks.” 
(Proceedings. Vol. IT., N.S.) 
Monpbay EVENING, MARcH 15TH, 1880. 
Sections I. and III —Physical and Kaperimental Science, 
and Applied Science. 
(With which the “ Dublin Scientific Club” is associated.) 
Professor BARRETT, F.R.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, Vol. IT., N.S.) 
G. Jounstone STONEY, D.sc., F.R.s.—“ Note on Maxwell’s Theory of 
Stresses in Rarified Gases.” 
G. Jounstone 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.” 
Artuur E, Porte—Exhibited a Telephone Exchange at work. 
