TRANSACTIONS (NEW SERIES). 
VOLUME LI. 
(Already Published.) 
PART. 
1.—On Great Telescopes of the Future. By Howarp Gruss F.R.A'S. (November, 1877.) 
2.—On the Penetration of Heat across Layers of Gas. By G. J. Stonny, M.A., F.R.S. (November, 
1877.) 
3.—On the Satellites of Mars. By WerntwortH Ercx, LL.D. (May, 1878.) 
4.—On the Mechanical Theory of Crookes’s, or Polarization Stress in Gases. By G. J. STONEY 
M.A., F.R.S. (October, 1878.) 
5.—On the Mechanical Theory of Crookes’s Force. By Grorce Francis FirzgGeraup, M.A., 
F.T.C.D. (October, 1878.) 
6.—Notes on the Physical Appearance of the Planet Mars, as seen with the Three-foot Reflector at 
Parsonstown, during the Opposition of 1877. By Jonn L. KH. Dreyer,M.A. With Plates I. 
and II. (November, 1878.) 
'7—On the Nature and Origin of the Beds of Chert in the Upper Carboniferous Limestone of Ireland. 
By Professor EDWARD HULL, M.A., F.RS., Director of the Geological Survey of Ireland. And . 
On the Chemical Composition of Chert and the Chemistry of the Process by which it, is 
formed. By Epwarp T. HarpMay, F.cs. With Plate II]. (November, 1878.) 
8.—On the Superficial Tension of Fluids and its Possible Relation to Muscular Contractions. 
By G. F. FrvzGeRALD, M.A., F.1.0.b. (December, 1878.) 
§.— Places of One Thousand Stars observed at the Armagh Observatory. By Rey. Tomas RoMNEY 
ROBINSON, D.D., LL.D., D.G.L., F.R.S., &C. (Hebruary, 1879.) 
10.—On the Possibility of Originating Wave Disturbances in the Ether by Means of Hlectric Forces. 
By Guo. Fras. FITZGERALD, M.A. F.0.C.D. (February, 1880.) 
11.—On the Relations of the Carboniferous, Devonian, and Upper Silurian Rocks of the South of 
Treland to those of North Devon. By Epwarp HULL, M.A., LL.D., F.R.S., Director of the 
Geological Survey of Ireland, and Professor of Geology, Royal College of Science, Dublin 
With Plates IV. and V., and Woodcuts. (May, 1880.) 
12.—Physical Observations of Mars, 1879-80. By C. E. BURTON, B.A. M.R.LA., F.R.AS. With Plates 
VI., VIL, and VIII. (May, 1880.) 
VOLUME ILI. 
1.—-Observations of Nebulee and Clusters of Stars, made with the Six-foot and Three-foot Reflectors 
at Birr Castle, from the year 1848 up to about the year 1878. Nos.1&2. By the Rieu 
Hon. THE HARL or Rosse, D.C.L., F.R.S. With Plates I. to IV. (August, 1879.) 
