TRANSACTIONS (NEW SERIES). 
VOLUME 1. 
(Recently Published.) 
PART, 
15.—Notes on the Physical Appearance of the Planet Jupiter shoring the Season 1880-1, By The 
Bart or Rosse and Dr. Orro BorppicKkerR.—Plate XV. (January, 1882.) 
16.—Photographs of the Spark Spectra of Twenty-one Elementary Substances. By W. A. 
HARTLEY, F.RS.E., Professor of Chemistry, Royal College of Science, Dublin, Plates XVI, 
XVII. and XVIII. (february, 1882.) 
17.—Notes on the Physical Appearance of the Comets 0 and ¢, 1881, as observed at Birr Castle, 
Parsonstown, Ireland. By The Eart or Rosse and Orro BoEDDICKER, PH.D. Plate XIX. 
(August, 1882.) : 
18.—On the Laurentian Rocks of Donegal, and of other parts of Ireland. By Epwarp isha, 
LL.D. F.RS., &c., Director of the Geological Survey of Ireland, Plates XX. and XXI. 
(February, 1882.) . ; 
19.—Palzeo-Geological and Geographical Maps of the British Islands and the adjoining parts of the 
Continent of Kurope. By HpwarpD HULL, LL.D., ERS, &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 Observatory, Birr Castle. By Orro BappickEr, Pu.D. 
With Plates XXXVI. and XXXVII. (December, 1882.) 
21.— Notes on the Aspect of Mars in 1882, By C. E. Burton, B.A., F.R.4.8., as seen with a Reflecting 
Telescope of 9-inch Aperture, and Powers of 270 and 600. With Plate XXXVIII. (January, 
1883.) 3 
22,On the Energy expended in Propelling a Bicycle. By G. JoHNSTONE STONEY, D.SG, F.R.S., a 
Vice-President of the Society; and G.GERALD Stony. With Plates XXXIX,, XL,and XLL. 
(January, 1883.) 
- VOLUME IL. (complete.) 
1.—Observations of Nebule and Clusters of Stars, made with the Six-foot and Three-foot Reflectors 
at Birr Castle, from the year 1848 up to the year 1878. Nos.1&2. By the RicuT Hon. 
THE HARL OF ROSSE, LL.D, D.O.L., F.RS. Plates 1. tolV. (August, 1879.) No. 3, Plates V. 
and VJ. (June, 1880.) 
2,—On Aquatic Carnivorous Coleoptera or Dytiscidew, By Dr. Suarp. Plates VII. to XVIII. 
(April, 1882.) 
