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TRANSACTIONS (SERIES II.). 
Vor. I.—Parts 1-25.—November, 1877, to September, 1883. 
Vou. II.—Parts 1-2.—August, 1879, to April, 1882. 
Vou. III.—Parts 1-14.—September, 1883, to November, 1887. 
Vor. IV.—Parts 1-14.—April, 1888, to November, 1892. 
Vou. V.—Parts 1-13.—May, 1893, to July, 1896. 
Vou. VI.—Parts 1-16.—February, 1896, to August, 1898. 
VOLUME VII. 
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. Harttey, 
F.R.S., and Huen RamaGs, A.R.c.sc.1. Plate I. (August, 1898.) 1s. 
. Radiating Phenomena in a Strong Magnetic Field. Part IJ.—Magnetic Perturbations aus 
the Spectral Lines. By Tuomas Preston, M.A., D.Sc., F.R.S. (June, 1899.) Is. 
. An Estimate of the Geological Age of the Earth. By J. Joty, M.A., B.A.1., D.sc., F.R.S., 
F.G.S., M.R.I.A., Honorary Secretary of the Royal Dublin Society ; Professor of Geology 
and Mineralogy i in the University of Dublin. (November, 1899.) Is. 64. 
. On the Electrical Conductivity and Magnetic Permeability of various Alloys of Iron. By 
W. FE. Barrett, F.R.S.; W. Brown, B.Sc.; R. A. Haprieztp, M.Inst.C.E. Plates 
II. to TX. (January, 1900.) 4s. 
. On some Novel Thermo-Electric Phenomena. By W. F. Barrert, F.R.S., Professor of 
Experimental Physics in the Royal College of Science for Ireland. Plate Xa. (January, 
1900 ets: 
. Jamaican Actiniaria. Part IJ.—Stichodactylinee and Zoanthee. By J. HE. Durrpen, 
Assoc. R. C. Sc. (Lond.), Curator of the Museum of the Institute of Jamaica. Plates 
X.to XV. (January, 1900.) 3s. 
. Survey of Fishing Grounds, West Coast of Ireland, 1890-1891. X.—Report on the 
Crustacea Schizopoda of Ireland. By Ernest W. L. Horr, and W. I. Beaumont, B.A., 
Cantab. Plate XVI. (April, 1900.) 1s. 6d. 
. The Action of Heat on the Absorption Spectra and Chemical Constitution of Saline Solutions. 
By W. N. Harrrery, F.R.S., Royal College of Science, Dublin. Plates XVII. to XXII. 
(September, 1900.) 3s. 6d. 
. On the Conditions of Equilibrium of Deliquescent and Hygroscopic Salts of Copper, Cobalt, 
and Nickel, with respect to Atmospheric Moisture. By W. N. Harrrny, F.RS., 
Honorary Fellow of King’s College, London; Professor of Chemistry, Royal College of 
Science, Dublin. Plates XXIII., XXIV., and XXV. (July, 1901.) Is. 
A New Collimating-Telescope Gun-Sight for Large and Small Ordnance. By Str Howarp 
Gruss, F.R.S., Vice-President, Royal Dublin Society. Plate XX VI. (August,1901.) Is. 
Photographs of Spark Spectra from the Large 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. EH. Avrnry, D.Sc., A.R.C.Sc.1., Curator 
and Examiner in Chemistry in the Royal University of Ireland, Dublin. Plates 
XXVII. and XXVIII. (September, 1901.) Is. 
. Banded Flame-Spectra of Metals. By W. N. Harruny, F.R.S., Honorary Fellow of King’s 
College, London; Royal College of Science, Dublin; and Hueu Ramage, B.A., 
A.R. ‘ Sc.L., St. John’s College, Cambridge. Plates XXIX. to XXXIII. (October, 
1901.) Is. 
Variation: Germinal and Environmental. By J.C. Ewart, M.D., F.R.S., Regius Professor 
of Natural History in the University of Edinburgh. (October, 1901.) ds. 
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