ROYAL DUBLIN SOCIETY. 
HUNDRED AND FORTY-EIGHTH SESSION, 1878-79. 
MINUTES OF PROCEEDINGS. 
Monbay EvENING, NOVEMBER 18TH, 1878. 
Section I—Physical and Experimental Science. 
(With which the “ Dublin Scientific Club” is associated.) 
Rey. RICHARD TOWNSEND, M.A., F.T.C.D., F.R.S., in the Chair. 
The following Communications were laid before the Section:— 
Professor W. F. Barrett, F.R.S.E.—‘* On Edison’s Micro. -tasimeter, and 
its applications in Physics and Meteorology.” 
Rev. Grratp Mottoy, p.p.—“ On a New Form of Experiment to illus- 
trate Stable Equilibrium.” 
G. JOHNSTONE STONEY, M.A., F.R.S.—‘‘ Comparison of Mr. Crookes’s 
Experiments on Radiometers with the Theory of Polarization Stress 
in Gases.” 
WeEntTWorTH ErckK, LL.D.—Exhibited a new form of Electrical Resistance 
instrument. 
Section II.—Natural Science. 
(With which the “ Royal Geological Society of Ireland” is 
associated.) 
Rev. MAXWELL H. CLOSE, M.A., in the Chair. 
The following Communications were laid before the Section :— 
J. Gwyn JEFFREYS, LL.D., F.R.S.—“ On some of the Mollusca procured 
by the Arctic Expedition of ‘The Fox’ in 1858-59.” 
(Proceedings, Vol. II., Part IT.) 
G. H. Kryawan, M.R.1.A.—“ The Silurian Rocks of Ireland, and their 
relations to the Old Red Sandstone.” 
(Proceedings, Vol. II., Part IT.) 
Professor E. RryNoips, M.D., and V. Babi, M.A., F.a.8.—“On an 
Artificial Mineral produced in the manufacture of Basic Bricks at 
Blaenavon, Monmouthshire.” 
(Proceedings, Vol. IT., Part IT.) 
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