TRANSACTIONS (SERIES Il.). 
Vor. I.—Parts 1-25.—November, 1877, to September, 1883. 
Vou. II.—Parts 1-2.—August, 1879, to April, 1882. 
Vou. II1I.—Parts 1-14.—September, 1883, to November, 1887. 
Vou. 1V.—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 
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. Harrrey, 
F.R.s.. and Huew Ramaae, A.R.c.sc.1. Plate I. (August, 1898.) 1s. 
2. Ntadiating Phenomena in a Strong Magnetic Field. Part I1.—Magnetie Perturbations of 
the Spectral Lines. By Tuomas Preston, M.A., D.sc., F.R.S. (June, 1899.) Is. 
3. An Hstimate of the Geological Age of the Earth. By J. Joly, M.A., B.A.1., D.SC., F.R.S., 
F.G.S., M.R.1.A., Honorary Secretary of the Royal Dublin Society; Professor of Geology 
and Mineralogy in the University of Dublin. (November, 1899.) Is. 64. 
4. On the Electrical Conductivity and Magnetic Permeability of various Alloys of Iron. By 
W. F. Barrett, F.R.S.; W. Brown, B.Sc.; R. A. Haprieip, M.Inst.C.E. Plates 
Il. toIX. (January, 1900.) 4s. 
. On some Novel Thermo-Electric Phenomena. By W. F. Barrerz, F.R.S., Professor of 
Experimental Physics in the Royal College of Science for Ireland. PlateIXa. (January, 
IUSOXO 1s 
6. Jamaican Actiniaria. Part I].—Stichodactylinee and Zoanthese. By J. EH. Duzrpmn, 
Assoc. Rt. C. Se. (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.—Iteport on thie 
Crustacea Schizopoda of Ireland. By Ernesy W. L. Hour, and W. J. Beaumony, B.A., 
Cantab. Plate XVI. (April, 1900.) 1s. 6d. 
8. The Action of Heat on the Absorption Spectra and Chemical Constitution of Saline Solutions. 
By W. N. Harriey, F.R.S., Royal College of Science, Dublin. Plates XVII. to XXIT. 
(September, 1900.) 3s. 6d. 
9. On the Conditions of Hquilibrium of Deliquescent and Iygroscopic Salts of Copper, Cobalt, 
and Nickel, with respect to Atmospheric Moisture. By W. N. Uarriey, E.R.S., 
Honorary Fellow of King’s College, London; Professor of Chemistry, Royal College of 
Science, Dublin. Plates XXIII, XXIV., and XXV. (July, 1901.) Is. 
Or 
