TRANSACTIONS (SERIES II.). 



Vol. I.— Parts 1-25.— November, 1877. to September, 1883. 



Vol. II.— Parts 1-2.— August, 1879, to April, 1882. 



Vol. III.— Parts 1-14.— September, 1883. to November, 1887. 



Vol. IV.— Parts 1-14.— April, 1888, to November, 1892. 



Yoi,. v.— Parts 1-13.— May, 1893, to July, 1896. 



Vol. VI.— Parts 1-16.— February, 1896, to August, 1898. 



VOLUME VII. 



Part 



1. A Determination of the Wave-lengths of the Principal Lines in the Spectrum of Grallium, 



showing their Identity with Two Lines in the Solar Spectrum. By W. N. Hartley, 

 F.R.S., and Hugh Eamage, a.k.c.sc.i. Plate I. (August, 1898.) Is. 



2. Eadiating Phenomena in a Strong Magnetic Field. Part II. — Magnetic Perturbations of 



the Si°ectral Lines. By Thomas Preston, m.a., d.sc, f.r.s. (June, 1899.) Is. 



3. An Estimate of the Geological Age of the Earth. By J. Joly, m.a., b.a.i., d.sc, f.r.s., 



F.G.S., M.R.I. A., Honorary Secretary of the Eoyal Dublin Society ; Professor of Geology 

 and Mineralogy in the University of Dublin. (November, 1899.) Is. 6'^. 



4. On the Electrical Conductivity and Magnetic Permeability of various Alloys of Iron. By 



W. F. Barrett, F.R.S. ; W. Brown, B.Sc. ; E. A. Hadfield, M. Inst. C.E. Plates 

 II. to IX. (January, 1900.) 4s. 



5. On some Novel Thermo-Electric Phenomena. By "W. F. Barrett, F.R.S. , Professor of 



Experimental Physics in the Royal College of Science for Ireland. Plate IXa. (January, 

 1900.) Is. 



6. Jamaican Actiniaria. Part II.— Stichodactylinse and Zoanthete. By J. E. Duerden, 



Assoc. R. C. Sc. (Lond.), Curator of the Museum of the Institute of Jamaica. Plates 

 X. to XV. (January, 1900.) 3s. 



7. Survey of Fishing Grounds, West Coast of Ireland, 1890-1891. X.— Report on the 



Crustacea Schizoyioda of Ireland. By Ernest W. L. Holt, and W. I. Beaumont, B.A., 

 Cantab. Plate XVL (April, 1900.) Is. 6(^. 



8. The Action of Heat on the Absorption Spectra and Chemical Constitution of Saline Solutions. 



By W. N. Hartley, F.R.S., Royal College of Science, Dublin. Plates XVII. to XXII, 

 (September, 1900.) 3s. 6(/. 



9. On the Conditions of Equilibrium of Deliquescent and Hygroscopic Salts of Copper, Cobalt, 



and Nickel, with resjiect to Atmosplieric Moisture. By W. N. Hartley, F.R.S., 

 Honorary Fellow of King's College, London ; Professor of Chemistry, Royal College of 

 Science, Dublin. Plates XXIIL, XXIV., and XXV. (July, 1901.) Is. 



10. A New Collimating-Telescope Gun-Siglit for Large and Small Ordnance. By Sir Hovs^ard 



Grubb, F.E.S., Vice-President, Royal Dublin Society. PlateXXVI. (August, 1901.) Is. 



11. Photographs of Spark Spectra from the Largo Rowland Spectrometer in the Royal 



University of Ireland. Part I. The Ultra- Violet Spark Spectra of Iron, Cobalt, Nickel, 

 Ruthenium, Rhodium, Palladium, Osmium, Iridium, Platinum, Potassium Chromate, 

 Potassium Permanganate, and Gold. By W. E. Adeney, D.Sc, A.R.C.Sc.L, Curator 

 and Examiner in Chemistry in the Royal University of Ireland, Dublin. Plates 

 XXVIL and XXVIII. (September, 1901.) Is. 



12. Banded Flame-Spectra of Metals. By W. N. Hartlicy, F.R.S., Honorary Fellow of King's 



College, London; Royal College of Scieuce, Dublin; and Hugh Ramage, B.A., 

 A.R.C.Sc.L, St. John's College, Cambridge. Plates XXIX. to XXXIII. (October, 

 1901.) Is. 



13. Variation: Germinal and Euvironmental. By J. C. Ewart, M.D., F.R.S., Regius Professor 



of Natural History in the University of Edinburgh. (October, 1901.) Is. 



14. The Results of an Electrical Experiment, involving the Relative Motion of the Earth and 



Ether, suggested by the late Professor Fitz Gerald. By Fred. T. Trouton, D.Sc, 

 F.E.S., University Lecturer in Experimental Physics, Trinity College, Dublin. (April, 

 1902.) Is. 



