TRANSACTIONS (SERIES II.). 



Vol. I.— Parts 1-25.— November, 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. 



Pakt 



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. Hartley, 

 F.R.S., and Hugh Ramage, a.r.o.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.so., f.r.s., 



F.G.s., M.R.I. A., Honorary Seci-etary of the Royal Dublin Society ; Professor of Geology 

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



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. Hadfield, M. Inst. C.B. Plates 

 II. to IX. (January, 1900.) 4s. 



5. On some Novel Thermo-Eleetric 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. 



6. Jamaican Actiniaria. Part II. — Stichodactylinse and Zoanthete. By J. E. Duerden, 



Assoc. R. C. Sc. (Lond.), Curator of the Museum of the Institute of Jamaica. Plates 

 X. to XV. (January, 1900.) 3s. 



