LIST OF ILLUSTRATIONS. 
Plates l and 2.—Professor C. V. Boys on the Newtonian Constant of Gravitation. 
Plate 3.—Mr. Witiram Crookes on the Spectra of Argon. 
Plates 4 to 6.—Mr. E. H. Grirriras on the Latent Heat of Evaporation of Water. 
Plates 7 to 16.—Mr. K. Pearson on the Mathematical Theory of Evolution.—II. 
Skew Variation in Homogeneous Material. 
Plate 17.—Mr. T. Wricutson on Iron and Steel at Welding Temperatures. 
