( 2 ) 



PABT. 



1 1 . — On the Relations of the Carboniferous, Devonian, and Upper Silurian 

 Rocks of the South of Ireland to those of North Devon. By Edward 

 Hull, m.a., ll.d., f.e.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., p.k.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 Erancis 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, m.b., p.k.s., G. H. Kinahan, m.r.i.a., 

 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, ph.d. Plate XV. (January, 

 1882.) 



16. — Photographs of the Spark Spectra of Twenty-one Elementary Substan- 

 ces. By W. N. Hartley, f.b.s.e., Professor of Chemistry, Royal 

 College of Science, Dublin. Plates XVL, XV1L, and XVII I. (Feb. 

 1882.) 



17. —Notes on the Physical Appearance of the Comets b and c, 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, il.d., p.e.s., &c, Director of the Geological Survey 

 of Ireland. Plates XX. and XXI. (February, 1882.) 



19. — Palseo-Geological and Geographical Maps of the British Islands and 

 the adjoining parts of the Continent of Europe. By Edward Hull, 

 ll.d., f.e.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, ph.d. Plates XXXVI. 

 and XXXVII. (December, 1882.) 



21. — Notes on the Aspect of Mars in 1882. By C. E. Burton, b.a., f.b.a.s., 

 as seen with a Reflecting Telescope of 9 -inch Aperture, and Powers 

 of 270 and 600. Plate XXXVIII. (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.i.c.d., Erasmus Smith's Professor 

 of Experimental Science in the University of Dublin. (Jan., 1883.) 



