( 8 ) 



PART. 



13, — Of Atmospheres upon Planets and Satellites. By G. Johnstone 

 Stoney, m.a., d.sc., e.r.s., e.r.a.s., Vice-President of the Physical 

 Society, &c. (November, 1897.) 



14. — Jamaican Actiniaria. Part I. — Zoanthese. By J. E. Duerden, Assoc. 

 r.c.sc. (Lond.), Curator of the Museum of the Institute of Jamaica. 

 Plates XVII. a, XVIII. a, XIX., XX. (April, 1898.) 



15. — Radiation Phenomena in a Strong Magnetic Field. By Thomas 

 Preston, m.a., f.e.u.i. Plate XXI. (April, 1898.) 



16. — The Actiniaria of Torres Straits. By Alfred C. Haddon, m.a., d.sc, 

 Professor of Zoology, Eoyal College of Science, Duhlin. Plates 

 XXII. to XXXII. (August, 1898.) [Title-page, Contents, and 

 Index to Volume VI , Series 77. ] 



CONTENTS OF VOLUME VII. (New Series). 



PART. 



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.e.c.sc.i. Plate I. (August, 1898.) 



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.) 



3. — An Estimate of the Geological Age of the Earth. By J. Joly, m.a., 

 b.a.i., d.sc, f.r.s., e.g.s., m.r.i.a., Honorary Secretary of the Royal 

 Dublin Society ; Professor of Geology and Mineralogy in the Uni- 

 versity of Dublin . (November, 1899.) 



4._On the Electrical Conductivity and Magnetic Permeability of various 

 Alloys of Iron. By W. F. Barrett, f.r.s. ; W. Brown, d.sc ; R. A. 

 Hadfield, m.inst.ce. Plates II. to IX. (January, 1900.) 



5. — 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 IX. a. (January, 1900.) 



6. — Jamaican Actiniaria. Part II. — Stichodactylinge and Zoanthese. By 

 J. E. Duerden, assoc r.c.sc (Lond.), Curator of the Museum of the 

 Institute of Jamaica. Plates X. to XV. (January, 1900.) 



7.— Survey of Fishing Grounds, West Coast of Ireland, 1890-1891. 

 X. — Report on the Crustacea Schizopoda of Ireland. By Ernest 

 W. L. Holt and W. L. Beaumont, b.a., Cantab. Plate XVI. 

 (April, 1900.) 



