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. LV.—Parts 1-14.—April, 1888, to November, 1892. 
Vout. 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. Hartrey, 
F.R.S., and HueH Ramaes, 4.R.c.sc.1. Plate I. (August, 1898.) 1s. 
2. Radiating Phenomena in a Strong Magnetic Field. Part I1.—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. Joy, M.A., B.A.I., D.SC., 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.) 1s. 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.H. Plates 
II. to TX. (January, 1900.) 4s. 
5. 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. PlateIXa. (January, 
1900.) Is. 
6. Jamaican Actiniaria. Part I].—Stichodactyline and Zoanthee. By J. EH. Dunrpsn, 
Assoc. R. 0. Se. (Lond.), Curator of the Museum of the Institute of Jamaica. Plates 
X.to XV. (January, 1900.) 3s. 
