LIST OF ILLUSTRATIONS. 
Plate I. — Mr. George W. Callender on the Formation of some of the Snbaxial 
Arches in Man. • 
Plate II. — Mr. C. F. Varley on Polarization of Metallic Surfaces in Aqueous Solutions. 
Plates III. to X. — Mr. W. K. Parker on the Structure and Development of the Skull 
of the Common Frog. 
Plates XI. to XIV,' — Professor Owen on the Fossil Mammals of Australia. 
