PROCEEDINGS 



OF THB 



ROYAL IRISH ACADEMY. 



SOIElJsTC E. 



Ser. ii.j Vol. iv.] JULT, 1886. ' [No. 5. 



CONTENTS. 



PAGB 



XXYII. — Preliminary Report on the Fauna of Dublin Bay. By Alfked 

 C. Haddox, M.A., M.R.I.A., F.Z.S., &c., Professor of Zoology, 



Royal College of Science, Dublin, 523 



XXVIII. — Note on the Character of the Linear Transformation which cor- 

 responds to the Displacement of a Rigid System in Elliptic 



Space. By R. S. Ball, LL.D., F.R.S., 532 



XXIX On the Orbit of the Binary Star j3 Delphini. By J. E. Goee, 



M.R.I. A., F.R.A.S., Associate of the Liverpool Astronomical 



Society, 538 



XXX. — On the Harmonic Hexagon of a Triangle. By John Caset, 



LL.D., F.R.S 545 



XXXI. — Notes on Laplace's Analytical Theory of the Perturbations of 



Jupiter's Satellites. By Sik Robert S. Ball, LL.D., F.R.S. , 357 

 XXXIL — Further Report on the Flora of Southern Donegal. By Henet 



Chichestee Haet, B.A., 568 



XXXIII. — On the Fluid State of Bodies composing our Planetary System. 

 By Henry Hennessy, F.R.S., Professor of Applied Mathe- 

 matics in the Royal College of Science, Dublin, . . . 580 

 XXXIV.— On the Orbit of the Binary Star 0. Struve 234. By J. E. Goee, 



F.R.A.S., 586 



XXXV. — Report of Researches at Killarney and South of Ireland : 



Macrolepidoptera, &c. By W. F. de V. Kane, F.E.S., . 588 

 XXXVI. — First Report on the Marine Fauna of the South-west of Ireland, 59 

 XXXVII. — Abstract of Discussion of the Greenwich Observations of Hourly 

 Temperatures. By Rev. Samitel Hatjghion, M.D., Dubl. ; 

 D.C.L., Oxon. ; LL.D., Cantab, and Edin,, . . . .639 

 XXXVIII. — Observations on Nova Andromedae, made at Dunsink. By SiE 



RoBEET Stawell Ball, LL.D., F.R.S., 641 



XXXIX. — Note on the Astronomical Theory of the Great Ice Age. By Sie 



RoBEET Stawell Ball, LL.D., F.R.S., .... 642 



List of Membees coeeected to July, 1886. 



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