HOYAL DUBLIN SOCIETY. 



HUNDRED AND FIFTIETH SESSION, 1880-81. 



MINUTES OF PROCEEDINGS. 



Monday Evening, November 15th, 1880. 



Sections I. and II. — Physical and Experimented Science, and 



Applied Science. 

 With wliicli the " Dublin Scientific Club" is associated. 



Wentworth Erck, ll.d., F.R.A.S., in the Chair. 



The following Communications were laid before the Section : — 



C. E. Burton, b.a., f.r.a.s., and Howard Grubb, m.e., f.r.a.s. "A 



New Form of Ghost Micrometer for Astronomical Instruments " 

 (Proceedings, Vol. III., N.S., Part I.) 

 William Smith, c.e.— " Preliminary Note on the Manufacture of Paper 

 from Purple Melic Grass [Molinia coerulea). 

 (Proceedings, Yol. III., N.S., Part I.) 

 G. F. Fitzgerald, f.t.c.d.— "Eecent Advances in Physical Science" :— 



1. Captain Galton's mode of determining the heights and distances of 



Clouds. 



2. Professor Osborne Reynolds's Theory of how Oil stops the pro- 



pagation of Waves on the surface of Water. 



Section III. — Natural Science. 



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

 associated. 



G. H. KiNAHAN, President E.G.S.I., in the Chair. 

 The following Communications were laid before the Section: — 



R. J. UssHER and Dr. Leith Adams, f.r.s. — "Explorations in the 

 Bone Cave of Ballynamintra, near Cappagh, Co. Waterford ;" with a 

 description of the Physical Features of the vicinity, by G. H. Kinahan, 

 President, r.g.s.l 



(Transactions, Yol. I., Part XI Y., in press.) 



Percy E. Freke. — " North American Birds in Europe." 

 (Proceedings, Yol. III., N.S., Parti.) 



David M'Ardle. — " Notes on some new and rare Irish Hepaticse." 

 (Proceedings, Yol. III., N.S., Part I.) 



