LIST OF ILLUSTRATIONS. 
Plates 1 to 5. —Professor K. Peaeson on the Mathematical Theory of Evolution. 
Plates 6 and 7. — Professor W. N. Hartley on Flame Specti-a at High Temperatures. 
—Part I. Oxy-hydrogen Blow-pipe Spectra. 
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Plate 8.—Messrs. T. E. Thorpe and J. W. Rodger on the Relations between the 
Viscosity (Internal Friction) of Liquids and their Chemical Nature. —Bakerian 
Lecture. 
Plates 9 to 11.—Professor J. N. Lockyer on the Results obtained with the Prismatic 
Cameras during the Total Eclipse of the Sun, April 16, 1893. 
Plates 12 and 13. —Professor J. N. Lockyer on the Photographic Arc Spectrum of 
Electrolytic Iron. 
Plate 14.— Professor W. N. Hartley on Flame Spectra at High Temperatures.— 
Part II. The Spectrum of Metallic Manganese, of Alloys of Manganese, and of 
Compounds containing that Element.—Part HI. The Spectroscopic Phenomena 
and Thermo-Chemistry of the Bessemer Process. 
