[ vi ] 



LIST OF ILLUSTRATIONS. 



Plate 1. Sir WILLIAM CROOKES on Scandium. 



Plates 2-4. Dr. S. R. MILNER on the Nature of the Streamers in the Electric Spark. 



Plates 5-9. Messrs. WALTER ROSENHAIN and P. A. TUCKER : Eutectic Research. 

 No. 1. The Alloys of Lead and Tin. 



Plates 10, 11. Dr. W. GEOFFREY DUFFIELD on the Effect of Pressure upon Arc 

 Spectra. No. 2. Copper, X 4000 to X 4600. 



Plates 12, 13. Prof. A. FOWLER on the Spectrum of Magnesium Hydride. 



