rANUABY, 1891.] 
PUBLICATIONS 
OF THE 
ROYAL IRISH ACADEMY. 
TRANSACTIONS: 
Quarto, Boards; or in Paris, siifohed. 
Vols. I. to XXVIII. (some out of print.) 
Vol. XXIX. (Current Volume.) 
I. — On the Plane Sections of the Cylindroid. Eeing the Seventh Memoir on the Theory 
of Screws. By Sir Eobert S. Eall, LL.D., F.E.S. (With Plates I. and II.) 
Price 3s. (Decemher, 1887.) 
I. — On the Ogham Monument at Kilcolman. By the Eight Eev. Dr. Graves, Lord 
Bishop of Limerick. Price Is. (Decemher, 1887.) 
i. — On Two-Nosed Catenaries and their application to the Design of Segmental Arches. 
By T. Alexander, C.E. ; and A. W. Thomson, B.Sc, Assoc. Mem. Inst. C.E. 
(With Plate III.) Price 3s. (Novemher, 1888.) 
\. — The Brain and Eyehall of a Human Cyclopian Monster. By D. J. Cunningham, 
M.D. (Edinb. et Dubl.) ; and E. H. Bennett, M.D. (With Plates IV. and V.) 
Price \s.U. (November, 1888.) 
>. — On the Theory of the Content. By Sir Egbert S. Ball, LL.D., F.E.S. Price 
2s. ^d. (January, 1889.) 
;.— The Tripartite Life of St. Patrick: New Textual Studies. By the Eev. B. 
Mac Carthy, D.D. Price Is. (May, 1889.) 
'. — Geometrical Illustrations of Newlands' and Mendelejeff's Periodic Law of the Atomic 
Weights of the Chemical Elements. By the Eev. Samuel Haughton, M.D. 
(Dubl. et Bonon.), D.C.L. (Oxon.), LL.D. (Cantab, et Edinb.). Price 2s. 
(June, 1889.) 
— The Eighth Memoir on the Theory of Screws, showing how Plane Geometry Illus- 
trates General Problems in the Dynamics of a Eigid Body with Three Degrees of 
Freedom. By Sir Egbert S. Ball, LL.D., F.E.S. (With Plate VI.) Price 
Is. U. (June, 1889.) 
. — The Focal Circles of Spherical Conies. By the Eight Eev. Dr. Graves, Lord 
Bishop of Limerick. Price Is. (July, 1889.) 
.—On Three Similar Figures, with an Extension of Feuerbach's Theorem. By 
William S. M'Cay, M.A., F.T.C.D. Price Is. (July, 1889.) 
. — On the Motion of a Particle, and the Equilibrium of Flexible Strings on a Spherical 
Surface. By T. Preston, M.A. Price Is. (July, 1889.) 
.—The Pectoral Group of Muscles. By Bertram C. A. Windle, M.A., M.D. (Dubl.) ; 
Professor of Anatomy, Queen's College, Birmingham. Price Is. (November, 1889.) 
. — Markree Observations of Double Stars. By W. Doberck, Ph.D., M.E.I. A., 
Director of the Hong-Kong Observatory. Price Is. (March, 1890.) 
., — Contributions to a knowledge of the Granites of Leinster. By W. J. Sollas, LL.D., 
F.E.S., Professor of Geology and Mineralogy, Dublin University. Price 3s. M. 
(January, 1891.) 
^ For Parts of Vols. XXVI. to XXVIIT., seepage 6. 
