TRANSACTIONS (SERIES IlI.). 
Vout. I.—Parts 1-25.—November, 1877, to September, 1883. 
Vou. II.—Parts 1-2.—August, 1879, to April, 1882. 
Vox. IIIJ.—Parts 1-14.—September, 1883, to November, 1887. 
Vox. I[V.—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. 
Parr 
Ils 
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. ‘Harte EY, 
F.R.S., and HueH Ramaaee, 4.R.c.sc.1. Plate I. (August, 1898.) Is. 
. Radiating Phenomena in a Strong Magnetic Field. Part I11.—Magnetic Perturbations of 
the Spectral Lines. By Tuomas Preston, M.A., D.SC., F.R.s. (June, 1899.) 1s. 
. An Estimate of the Geological Age of the Harth. By J. Joty, M.a., B.A.1., D.8¢., F.R.S., 
F.G.S., M.R.I.A., Honorary Secretary of the Royal Dublin Society; Professor of Geology 
and Mineralogy in the University of Dublin. (November, 1899.) Is. 64 
. On the Electrical Conductivity and Magnetic Permeability of various Alloys of Iron. By 
W. F. Barrert, F.R.S.; W. Brown, B.Sc.; R. A. Hapriztp, M.Inst.C.E. Plates 
II. toIX. (January, 1900.) 4s. 
. 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. 
. Jamaican Actiniaria. Part II.—Stichodactylinse and Zoanthee. By J. EH. Duzrpen, 
Assoc. R. 0. Se: (Lond.), Curator of the Museum of the Institute of Jamaica. Plates 
X.to XV. (January, 1900.) 3s. 
