PUBLICATIONS OF THE ROYAL IRISH ACADEMY. 
TRANSACTIONS: Quarto, boards ; or in parts, stitched. 
Vols. I. to XXIII. (some out of print). For Prices, &c., inquire at the Academy. 
Vol. XXIV.—Scrence (complete), 31s. 67. 
= PoLitE LITERATURE (complete), ds. 
together (with title), 24s. 
” ANTIQUITIES (complete), 19s. 6d. 8 ( e), 24s 
Vol. XXV.—ScrencE (complete), 37s. 6d. 
Vol. XX VI.—(Scrence) :—(Complete). 35s. 
Part 20.—On the Equations of Circles (Second Memoir). By Joun Casey, 
LL.D., F.R.S., M.R.I.A., Professor of Mathematics in the Catholic University of 
Ireland. [Published April, 1879.] 
Part 21.—On the Correlation of Lines of Direction on the Earth’s Surface. 
By JoserH P. O’Reitty, C.E. Central School of Paris ; Professor of Mining and 
Mineralogy, Royal College of Science, Ireland. [Published June, 1879.] 
Part 22.—Explanatory Notes and Discussion of the Nature of the Prismatic 
Forms of a Group of Columnar Basalts, Giant’s Causeway. By JosnpH P. O’RErLy, 
C.E. Central School of Paris; Professor of Mining and Mineralogy, Royal College 
of Science, Ireland. (With Plates XV.to XVIII.) [Published November, 1879.] 
Vol. XXVII. (Poxrre Lit. and ANTIQUITIES) :— 
Part 2.—On an Ogam Monument in the County of Kerry. By the Rieur 
Rey. Dr. Graves, Lord Bishop of Limerick. {Published November, 1878. ] 
Part 3.—On the Croix Gammée, or Swastika. By the Ricut Rey. CHARLES 
Graves, D.D., M.R.I.A., Lord Bishop of Limerick, &e. (With Illustrations.) 
{Published April, 1879.] 
Part 4.—Fasciculus of Prints from Photographs of Casts of Ogham Inscrip- 
tions. By Sir Samvuen Ferevson, LL.D. (With Plates I*. to V.) 
Vol. XXVIII. (Scrence) :— 
Part 1.—On Chemical Equilibrium. By F. A. Tartreton, LL.D., F.T.C.D. 
{Published December, 1880. ] 
Part 2.—On a New Genus and Species of Sponge. By Dr. E. P. WricHa. 
(Plate I.) [Published February, 1881. ] 
Part 3.—On Blodgettia confervoides of Harvey, forming a new Genus and 
Species of Fungi. By Epw PercevaLt Wrient, M.A., M.D., F.L.S., Professor 
of Botany in the University of Dublin. (With Plate II.) [Published February, 
1881. 
Part 4,—On a new Genus and Species of Unicellular Alge, living on the Fila- 
ments of Rhizoclonium Casparyi. By Epw. Percrvan Wrieut, M.A., M.D. 
(With Plate II.) [Published February, 1881.] 
Part 5.—On the Periods of the First Class of Hyper-Elliptic Integrals. By 
Witiiam R. Wustropp Roperts, M.A. [Published March, 1881.] 
Part 6.—New Researches on Sun-heat and Terrestrial Radiation, and on Geo- 
logical Climates. By the Rev. SamueL HaveHron, M.D. Dubl.; D.C.L. Oxon. ; 
LL.D.Cantab. (Parts I. and II.) [Published October, 1881.] 
Part 7.—Extension of the Theory of Screws to the Dynamics of any Material 
System. By Roserr S. Baut, F.R.S., Astronomer Royal for Ireland. [Pub- 
lished November, 1881. ] 
[For continuation of List of Publications, see page iti. of this Cover. } 
