TRANSACTIONS (SERIES II. 



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



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



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



YoL. lY.— Parts 1-14.— April, 1888, to November, 1892. 



YoL. Y.— Parts 1-13.— May, 1893, to July, 1896. 



YoL. YI.— 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 Gallium, 



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

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



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



the Spectral 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. Qd. 



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



W. F. Barrett, F.E.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.E.S., Professor of 



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

 1900.) Is. 



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



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

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



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



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

 Cantab. Plate XYL (April, 1900.) Is. 6d. 



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



By W. N. Hartley, F.E.S., Eoyal College of Science, Dublin. Plates XYII. to XXII. 

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



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



and Nickel, with respect to Atmospheric Moisture. By W. N. Hartley, F.E.S. , 

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

 Science, Dublin. Plates XXIII., XXIY., and XXY. (July, 190L) Is. 

 10. A New CoUimating-Telescope Gun-Siglit for Large and Small Ordnance. By Sir Howard 

 GRUBB,F.E.S.,Yice-Presideut, Eoyal Dublin Society. Plate XXYI. (August, 1901.) Is. 



