LIST OF ILLUSTRATIONS. 
Plate 1. — Mr. J. E. H. Gordon on the Determination of Yerdet’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. 
