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Transactions, Vol. XXVI. (Science). 
PAKT 
1. — On the Binary Stars 44 Bootis, ij Cassiopeiae, and fi Draconis. By W. Doberck, Ph. D., 
Member of the International Astronomical Society, Astronomer at Markree 
Observatory. With Addenda to Frevious Memoirs. Price Is. 
2. — On the Intertubular Tissue of the Mammalian Testis. By Eeuben J. Harvey, M.D. 
(With Plate I.) Price 1*. 
3. — Report on the Chemical, Mineralogical, and Microscopical Characters of the Lavas 
of Vesuvius from 1631 to 1868. By Eev. Samuel Haughton, M.D., D.C.L., 
F.E.S., Fellow of Trinity College, and Professor of Geology in the University 
of Dublin; and Edward Hull, M.A., F.E.S., Director of the Geological 
Survey of Ireland. (With Plate II.) Price 4s. ed. 
4. — On w Leonis considered as a Eevolving Double Star. By W. Doberck, Ph.D., 
M.E.I. A., Astronomer at Markree Observatory. Price Is. 
5. — Eeport on the Exploration of Shandon Cave. By A. Leith Adams, F.E.S., F.G.S., 
Professor of Zoology in the Eoyal College of Science for Ireland. (With 
Plate III. and Woodcuts.) Price Is. 6d. 
6. — Eeport on the AUotropism of Selenium, and on the Influence of Light on the 
Electrical Conductivity of tbis Element. By Harry Napier Draper, F.C.S., 
and EicHARD J. Moss, F.C.S. Price Is. 
7. — The Eed Stars : Observations and Catalogue. By J. Birmingham. Price 4s. 
; 8. — On a new Species of Parasitic Green Alga belonging to the Genus Chlorochytrium 
ofCohn. By Edward Perceval Wright, M. A., M.D., F.L.S. ; Professor of 
I Botany in the University of Dublin ; Secretary to the Eoyal Irish Academy. 
(With Plates IV. and V.) 
9. On a Species of Ehizophydium Parasitic on Species of Ectocarpus, with notes on the 
Fructiti cation of the Ectocarpi. By Edward Perceval Wright, M.A., M.D., 
F.L.S. ; Professor of Botany in the University of Dublin; Secretary to the 
Eoyal Irish Academy. (With Plate VI.) Price Is. 6d. 
10. — A Supplement to Sir John Herschel's " General Catalogue of Nebulae and Clusters 
of Stars." By J. L. E. Dreyer, M.A., F.E.A.S., Astronomer at the Earl of 
Eosse's Observatory. Price 2s. 
U. — On the aspect of Mars at the Oppositions of 1871 and 1873. By C. E. Burton. 
(With Plates VII. and VIII.) Price Is. 
12. — Direct Demonstration of the Properties of the First Negative Pedal of a Central 
Conic from any Point in its Plane. By John C. Malet, M.A. Price Is. 
13. — On the Intersections of Plane Curves of the Third Order. By Andrew Searlb 
Hart, LL.D., Vice-Provost, Trinity College, Dublin. Price Is. 
14. — On a Proof that every Algebraic Equation has a Eoot. By John C. Malet, M.A. 
15. — On a certain Surface derived from a Quadric. By John C. Malet, M.A. Price Is. 
16. — Attempt to deduce the General Laws of the Variations of Temperature at the Earth's 
Surface from those of Solar and Terrestrial Eadiation. By the Eev. H. Lloyd, 
D.D., D.C.L., Provost of Trinity College, Dublin. Price Is. 
,7. — Eeport on the Acanthology of the Desmosticha (Haeckel). Part I. — On the 
Acanthological Eelations of the Desmosticha. By W. H. Mackintosh, B.A. ; 
Senior Moderator in Natural Science, Trinity College, Dublin. (With Plates IX., 
X., XI.) Price 2s. 
