LIST OF ILLUSTRATIONS. 
Plate 1. — Mr. J. E. H. Gordon on the Determination of Verdet’s Constant in Absolute 
Units. 
Plates 2 & 3. — Mr. H. N. Moseley on the Structure of a Species of Millejpora. 
Plate 4. — Messrs. Roscoe and Thorpe on the Absorption-Spectra of Bromine and of 
Iodine Monochloride. 
Plates 5 to 16. — Professor W. C. Williamson on the Organization of the Fossil Plants 
of the Coal-measures. 
Plates 17 to 19. — General Sir Edward Sabine on Terrestrial Magnetism. 
Plate 20. — Messrs. Fleeming Jenxin and J. A. Ewing on Friction between Surfaces 
moving at Low Speeds. 
Plates- 21 to 29. — Mr. W. K. Parker on the Structure and Development of the Skull 
in the Urodelous Amphibia. 
Plates 30 and 31. — Mr. G. J. Romanes on the Locomotor System of Medusae. 
