TRANSACTIONS (SERIES II.). 



Vol. I.— Parts 1-25.— NoYember, 1877, to September, 1883. 



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



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



Vol. IV.— Parts 1-14.— April, 1888, to November, 1892. 



Vol. v.— Parts 1-13.— May, 1893, to July, 1896. 



Vol. VI.— Parts 1-16.— February, 1896, to August, 1898. 



VOLUME VII. 



PARr 



1. A Determloation of the Wave-leugtlis of the Principal Lines in the Spectrum of Grallium, 



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

 F.R.s., and IIuGH Ramage, 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 Royal Dublin Society ; Professor of Geology 

 and Mineralogy in the University of Dublin. (November, 1899.) Is. 6d. 



