Ga) 
PART. 
11.—On the Relations of the Carboniferous, Devonian, and Upper Silurian 
Rocks of the South of Ireland to those of North Devon. By Edward 
Hull, u.a., 1u.p., F.R.s., Director of the Geological Survey of Ireland, 
and Professor of Geology, Royal College of Science, Dublin. Plates. 
IV. and V., and Woodcuts. (May, 1880.) 
12.—Physical Observations of Mars, 1879-80. By C. E. Burton, B.a., 
M.R.I.A., F.R.A.S. Plates VI., VII., and VIII. (May, 1880.) 
13.—On the Possibility of Originating Wave Disturbances in the Ether by 
means of Electric Forces. Part II. By George Francis Fitz Gerald, 
M.A., F.T.c.D. (November, 1880.) 
14.—Explorations in the Bone Cave of Ballynamintra, near Cappagh, Co. 
Waterford. By A. Leith Adams, u.z., F.z.s., G@. H. Kinahan, m.z.1..,. 
and R. J. Ussher. Plates IX. to XIV. (April, 1881.) 
15.—Notes on the Physical Appearance of the Planet Jupiter during the 
Season 1880-1. By Otto Boeddicker, pu.p. Plate XV. (January, 
1882.) ’ 
16.—Photographs of the Spark Spectra of Twenty-one Elementary Substan- 
ces. By W. N. Hartley, ¥.n.s.z., Professor of Chemistry, Royal 
College of Science, Dublin. Plates XVI., XVII., and XVIII. (Feb. 
1882.) 
17.—Notes on the Physical Appearance of the Comets 6 and ¢, 1881, as 
observed at Birr Castle, Parsonstown, Ireland. By Otto Boeddicker, 
PH.D. Plate XIX. (August, 1882.) 
18.—On the Laurentian Rocks of Donegal, and of other parts of Ireland. 
By Edward Hull, t1.p., ¥.x.s., &c., Director of the Geological Survey 
of Ireland. Plates XX. and XXI. (February, 1882.) 
19.—Paleeo-Geological and Geographical Maps of the British Islands and 
the adjoining parts of the Continent of Europe. By Edward Hull, 
LL.D., F.R.s., &c., Director of the Geological Survey of Ireland, and 
Professor of Geology in the Royal College of Science, Dublin. Plates 
XXII. to XXXV. (November, 1882.) 
20.—Notes on the Physical Appearance of the Planet Mars during the 
Opposition in 1881. Accompanied by {Sketches made at the Obser- 
vatory, Birr Castle. By Otto Boeddicker, pu.p. Plates XXXVI. 
and XXXVII. (December, 1882.) 
21.—Notes on the Aspect of Mars in 1882. By C. E. Burton, B.a., F.R.a.s., 
as seen with a Reflecting Telescope of 9-inch Aperture, and Powers 
of 270 and 600. Plate XX XVIII. (January, 1883.) 
22.—On the Energy expended in Propelling a Bicycle. By G. Johnstone 
Stoney, D.sc., F.R.S., a Vice-President of the Society ; and G. Gerald 
Stoney. Plates XXXIX.to XLI. (January, 1883.) 
23.—On Electromagnetic Effects due to the Motion of the Earth. By 
George Francis Fitz Gerald, m.a., F.t.c.D., Krasmus Smith’s Professor 
of Experimental Science in the University of Dublin. (Jan., 1883.), 
