LIST OF ILLUSTRATIONS. 
Plates 45, 46.—Dr. U. Pritchard on the Cochlea of the Ornithorhynchus platypus 
compared with that of ordinary Mammals and of Birds. 
Plates 47 to 54.—Professor W. C. Williamson on the Organization of the Fossil 
Plants of the Coal-Measures. 
Plates 55 to 58.-—Mr. W. Crookes on the Viscosity of Gases at High Exhaustions. 
Plates 59, 60.—Professors A. W. Reinold and A. W. Rucker on the Electrical 
Resistance of Thin Liquid Films, with a revision of Newton’s Table of Colours. 
Plates 61 to 63.—Mr. G. H. Darwin on the Tidal Friction of a Planet attended by 
several Satellites, and on the Evolution of the Solar System. 
Plates 64 to 66.—Professor Owen on some Remains of the Gigantic Land-Lizard 
(Megalania prisca) from Australia. 
